UPGRADING.md
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	Guzzle Upgrade Guide
	====================

	6.0 to 7.0
	----------

	In order to take advantage of the new features of PHP, Guzzle dropped the support
	of PHP 5. The minimum supported PHP version is now PHP 7.2. Type hints and return
	types for functions and methods have been added wherever possible.

	Please make sure:
	- You are calling a function or a method with the correct type.
	- If you extend a class of Guzzle; update all signatures on methods you override.

	#### Other backwards compatibility breaking changes

	- Class `GuzzleHttp\UriTemplate` is removed.
	- Class `GuzzleHttp\Exception\SeekException` is removed.
	- Classes `GuzzleHttp\Exception\BadResponseException`, `GuzzleHttp\Exception\ClientException`,
	`GuzzleHttp\Exception\ServerException` can no longer be initialized with an empty
	Response as argument.
	- Class `GuzzleHttp\Exception\ConnectException` now extends `GuzzleHttp\Exception\TransferException`
	instead of `GuzzleHttp\Exception\RequestException`.
	- Function `GuzzleHttp\Exception\ConnectException::getResponse()` is removed.
	- Function `GuzzleHttp\Exception\ConnectException::hasResponse()` is removed.
	- Constant `GuzzleHttp\ClientInterface::VERSION` is removed. Added `GuzzleHttp\ClientInterface::MAJOR_VERSION` instead.
	- Function `GuzzleHttp\Exception\RequestException::getResponseBodySummary` is removed.
	Use `\GuzzleHttp\Psr7\get_message_body_summary` as an alternative.
	- Function `GuzzleHttp\Cookie\CookieJar::getCookieValue` is removed.
	- Request option `exceptions` is removed. Please use `http_errors`.
	- Request option `save_to` is removed. Please use `sink`.
	- Pool option `pool_size` is removed. Please use `concurrency`.
	- We now look for environment variables in the `$_SERVER` super global, due to thread safety issues with `getenv`. We continue to fallback to `getenv` in CLI environments, for maximum compatibility.
	- The `get`, `head`, `put`, `post`, `patch`, `delete`, `getAsync`, `headAsync`, `putAsync`, `postAsync`, `patchAsync`, and `deleteAsync` methods are now implemented as genuine methods on `GuzzleHttp\Client`, with strong typing. The original `__call` implementation remains unchanged for now, for maximum backwards compatibility, but won't be invoked under normal operation.
	- The `log` middleware will log the errors with level `error` instead of `notice`
	- Support for international domain names (IDN) is now disabled by default, and enabling it requires installing ext-intl, linked against a modern version of the C library (ICU 4.6 or higher).

	#### Native functions calls

	All internal native functions calls of Guzzle are now prefixed with a slash. This
	change makes it impossible for method overloading by other libraries or applications.
	Example:

	```php
	// Before:
	curl_version();

	// After:
	\curl_version();
	```

	For the full diff you can check [here](https://github.com/guzzle/guzzle/compare/6.5.4..master).

	5.0 to 6.0
	----------

	Guzzle now uses [PSR-7](https://www.php-fig.org/psr/psr-7/) for HTTP messages.
	Due to the fact that these messages are immutable, this prompted a refactoring
	of Guzzle to use a middleware based system rather than an event system. Any
	HTTP message interaction (e.g., `GuzzleHttp\Message\Request`) need to be
	updated to work with the new immutable PSR-7 request and response objects. Any
	event listeners or subscribers need to be updated to become middleware
	functions that wrap handlers (or are injected into a
	`GuzzleHttp\HandlerStack`).

	- Removed `GuzzleHttp\BatchResults`
	- Removed `GuzzleHttp\Collection`
	- Removed `GuzzleHttp\HasDataTrait`
	- Removed `GuzzleHttp\ToArrayInterface`
	- The `guzzlehttp/streams` dependency has been removed. Stream functionality
	is now present in the `GuzzleHttp\Psr7` namespace provided by the
	`guzzlehttp/psr7` package.
	- Guzzle no longer uses ReactPHP promises and now uses the
	`guzzlehttp/promises` library. We use a custom promise library for three
	significant reasons:
	1. React promises (at the time of writing this) are recursive. Promise
	chaining and promise resolution will eventually blow the stack. Guzzle
	promises are not recursive as they use a sort of trampolining technique.
	Note: there has been movement in the React project to modify promises to
	no longer utilize recursion.
	2. Guzzle needs to have the ability to synchronously block on a promise to
	wait for a result. Guzzle promises allows this functionality (and does
	not require the use of recursion).
	3. Because we need to be able to wait on a result, doing so using React
	promises requires wrapping react promises with RingPHP futures. This
	overhead is no longer needed, reducing stack sizes, reducing complexity,
	and improving performance.
	- `GuzzleHttp\Mimetypes` has been moved to a function in
	`GuzzleHttp\Psr7\mimetype_from_extension` and
	`GuzzleHttp\Psr7\mimetype_from_filename`.
	- `GuzzleHttp\Query` and `GuzzleHttp\QueryParser` have been removed. Query
	strings must now be passed into request objects as strings, or provided to
	the `query` request option when creating requests with clients. The `query`
	option uses PHP's `http_build_query` to convert an array to a string. If you
	need a different serialization technique, you will need to pass the query
	string in as a string. There are a couple helper functions that will make
	working with query strings easier: `GuzzleHttp\Psr7\parse_query` and
	`GuzzleHttp\Psr7\build_query`.
	- Guzzle no longer has a dependency on RingPHP. Due to the use of a middleware
	system based on PSR-7, using RingPHP and it's middleware system as well adds
	more complexity than the benefits it provides. All HTTP handlers that were
	present in RingPHP have been modified to work directly with PSR-7 messages
	and placed in the `GuzzleHttp\Handler` namespace. This significantly reduces
	complexity in Guzzle, removes a dependency, and improves performance. RingPHP
	will be maintained for Guzzle 5 support, but will no longer be a part of
	Guzzle 6.
	- As Guzzle now uses a middleware based systems the event system and RingPHP
	integration has been removed. Note: while the event system has been removed,
	it is possible to add your own type of event system that is powered by the
	middleware system.
	- Removed the `Event` namespace.
	- Removed the `Subscriber` namespace.
	- Removed `Transaction` class
	- Removed `RequestFsm`
	- Removed `RingBridge`
	- `GuzzleHttp\Subscriber\Cookie` is now provided by
	`GuzzleHttp\Middleware::cookies`
	- `GuzzleHttp\Subscriber\HttpError` is now provided by
	`GuzzleHttp\Middleware::httpError`
	- `GuzzleHttp\Subscriber\History` is now provided by
	`GuzzleHttp\Middleware::history`
	- `GuzzleHttp\Subscriber\Mock` is now provided by
	`GuzzleHttp\Handler\MockHandler`
	- `GuzzleHttp\Subscriber\Prepare` is now provided by
	`GuzzleHttp\PrepareBodyMiddleware`
	- `GuzzleHttp\Subscriber\Redirect` is now provided by
	`GuzzleHttp\RedirectMiddleware`
	- Guzzle now uses `Psr\Http\Message\UriInterface` (implements in
	`GuzzleHttp\Psr7\Uri`) for URI support. `GuzzleHttp\Url` is now gone.
	- Static functions in `GuzzleHttp\Utils` have been moved to namespaced
	functions under the `GuzzleHttp` namespace. This requires either a Composer
	based autoloader or you to include functions.php.
	- `GuzzleHttp\ClientInterface::getDefaultOption` has been renamed to
	`GuzzleHttp\ClientInterface::getConfig`.
	- `GuzzleHttp\ClientInterface::setDefaultOption` has been removed.
	- The `json` and `xml` methods of response objects has been removed. With the
	migration to strictly adhering to PSR-7 as the interface for Guzzle messages,
	adding methods to message interfaces would actually require Guzzle messages
	to extend from PSR-7 messages rather then work with them directly.

	## Migrating to middleware

	The change to PSR-7 unfortunately required significant refactoring to Guzzle
	due to the fact that PSR-7 messages are immutable. Guzzle 5 relied on an event
	system from plugins. The event system relied on mutability of HTTP messages and
	side effects in order to work. With immutable messages, you have to change your
	workflow to become more about either returning a value (e.g., functional
	middlewares) or setting a value on an object. Guzzle v6 has chosen the
	functional middleware approach.

	Instead of using the event system to listen for things like the `before` event,
	you now create a stack based middleware function that intercepts a request on
	the way in and the promise of the response on the way out. This is a much
	simpler and more predictable approach than the event system and works nicely
	with PSR-7 middleware. Due to the use of promises, the middleware system is
	also asynchronous.

	v5:

	```php
	use GuzzleHttp\Event\BeforeEvent;
	$client = new GuzzleHttp\Client();
	// Get the emitter and listen to the before event.
	$client->getEmitter()->on('before', function (BeforeEvent $e) {
	// Guzzle v5 events relied on mutation
	$e->getRequest()->setHeader('X-Foo', 'Bar');
	});
	```

	v6:

	In v6, you can modify the request before it is sent using the `mapRequest`
	middleware. The idiomatic way in v6 to modify the request/response lifecycle is
	to setup a handler middleware stack up front and inject the handler into a
	client.

	```php
	use GuzzleHttp\Middleware;
	// Create a handler stack that has all of the default middlewares attached
	$handler = GuzzleHttp\HandlerStack::create();
	// Push the handler onto the handler stack
	$handler->push(Middleware::mapRequest(function (RequestInterface $request) {
	// Notice that we have to return a request object
	return $request->withHeader('X-Foo', 'Bar');
	}));
	// Inject the handler into the client
	$client = new GuzzleHttp\Client(['handler' => $handler]);
	```

	## POST Requests

	This version added the [`form_params`](https://docs.guzzlephp.org/en/latest/request-options.html#form_params)
	and `multipart` request options. `form_params` is an associative array of
	strings or array of strings and is used to serialize an
	`application/x-www-form-urlencoded` POST request. The
	[`multipart`](https://docs.guzzlephp.org/en/latest/request-options.html#multipart)
	option is now used to send a multipart/form-data POST request.

	`GuzzleHttp\Post\PostFile` has been removed. Use the `multipart` option to add
	POST files to a multipart/form-data request.

	The `body` option no longer accepts an array to send POST requests. Please use
	`multipart` or `form_params` instead.

	The `base_url` option has been renamed to `base_uri`.

	4.x to 5.0
	----------

	## Rewritten Adapter Layer

	Guzzle now uses [RingPHP](https://ringphp.readthedocs.org/en/latest) to send
	HTTP requests. The `adapter` option in a `GuzzleHttp\Client` constructor
	is still supported, but it has now been renamed to `handler`. Instead of
	passing a `GuzzleHttp\Adapter\AdapterInterface`, you must now pass a PHP
	`callable` that follows the RingPHP specification.

	## Removed Fluent Interfaces

	[Fluent interfaces were removed](https://ocramius.github.io/blog/fluent-interfaces-are-evil/)
	from the following classes:

	- `GuzzleHttp\Collection`
	- `GuzzleHttp\Url`
	- `GuzzleHttp\Query`
	- `GuzzleHttp\Post\PostBody`
	- `GuzzleHttp\Cookie\SetCookie`

	## Removed functions.php

	Removed "functions.php", so that Guzzle is truly PSR-4 compliant. The following
	functions can be used as replacements.

	- `GuzzleHttp\json_decode` -> `GuzzleHttp\Utils::jsonDecode`
	- `GuzzleHttp\get_path` -> `GuzzleHttp\Utils::getPath`
	- `GuzzleHttp\Utils::setPath` -> `GuzzleHttp\set_path`
	- `GuzzleHttp\Pool::batch` -> `GuzzleHttp\batch`. This function is, however,
	deprecated in favor of using `GuzzleHttp\Pool::batch()`.

	The "procedural" global client has been removed with no replacement (e.g.,
	`GuzzleHttp\get()`, `GuzzleHttp\post()`, etc.). Use a `GuzzleHttp\Client`
	object as a replacement.

	## `throwImmediately` has been removed

	The concept of "throwImmediately" has been removed from exceptions and error
	events. This control mechanism was used to stop a transfer of concurrent
	requests from completing. This can now be handled by throwing the exception or
	by cancelling a pool of requests or each outstanding future request
	individually.

	## headers event has been removed

	Removed the "headers" event. This event was only useful for changing the
	body a response once the headers of the response were known. You can implement
	a similar behavior in a number of ways. One example might be to use a
	FnStream that has access to the transaction being sent. For example, when the
	first byte is written, you could check if the response headers match your
	expectations, and if so, change the actual stream body that is being
	written to.

	## Updates to HTTP Messages

	Removed the `asArray` parameter from
	`GuzzleHttp\Message\MessageInterface::getHeader`. If you want to get a header
	value as an array, then use the newly added `getHeaderAsArray()` method of
	`MessageInterface`. This change makes the Guzzle interfaces compatible with
	the PSR-7 interfaces.

	3.x to 4.0
	----------

	## Overarching changes:

	- Now requires PHP 5.4 or greater.
	- No longer requires cURL to send requests.
	- Guzzle no longer wraps every exception it throws. Only exceptions that are
	recoverable are now wrapped by Guzzle.
	- Various namespaces have been removed or renamed.
	- No longer requiring the Symfony EventDispatcher. A custom event dispatcher
	based on the Symfony EventDispatcher is
	now utilized in `GuzzleHttp\Event\EmitterInterface` (resulting in significant
	speed and functionality improvements).

	Changes per Guzzle 3.x namespace are described below.

	## Batch

	The `Guzzle\Batch` namespace has been removed. This is best left to
	third-parties to implement on top of Guzzle's core HTTP library.

	## Cache

	The `Guzzle\Cache` namespace has been removed. (Todo: No suitable replacement
	has been implemented yet, but hoping to utilize a PSR cache interface).

	## Common

	- Removed all of the wrapped exceptions. It's better to use the standard PHP
	library for unrecoverable exceptions.
	- `FromConfigInterface` has been removed.
	- `Guzzle\Common\Version` has been removed. The VERSION constant can be found
	at `GuzzleHttp\ClientInterface::VERSION`.

	### Collection

	- `getAll` has been removed. Use `toArray` to convert a collection to an array.
	- `inject` has been removed.
	- `keySearch` has been removed.
	- `getPath` no longer supports wildcard expressions. Use something better like
	JMESPath for this.
	- `setPath` now supports appending to an existing array via the `[]` notation.

	### Events

	Guzzle no longer requires Symfony's EventDispatcher component. Guzzle now uses
	`GuzzleHttp\Event\Emitter`.

	- `Symfony\Component\EventDispatcher\EventDispatcherInterface` is replaced by
	`GuzzleHttp\Event\EmitterInterface`.
	- `Symfony\Component\EventDispatcher\EventDispatcher` is replaced by
	`GuzzleHttp\Event\Emitter`.
	- `Symfony\Component\EventDispatcher\Event` is replaced by
	`GuzzleHttp\Event\Event`, and Guzzle now has an EventInterface in
	`GuzzleHttp\Event\EventInterface`.
	- `AbstractHasDispatcher` has moved to a trait, `HasEmitterTrait`, and
	`HasDispatcherInterface` has moved to `HasEmitterInterface`. Retrieving the
	event emitter of a request, client, etc. now uses the `getEmitter` method
	rather than the `getDispatcher` method.

	#### Emitter

	- Use the `once()` method to add a listener that automatically removes itself
	the first time it is invoked.
	- Use the `listeners()` method to retrieve a list of event listeners rather than
	the `getListeners()` method.
	- Use `emit()` instead of `dispatch()` to emit an event from an emitter.
	- Use `attach()` instead of `addSubscriber()` and `detach()` instead of
	`removeSubscriber()`.

	```php
	$mock = new Mock();
	// 3.x
	$request->getEventDispatcher()->addSubscriber($mock);
	$request->getEventDispatcher()->removeSubscriber($mock);
	// 4.x
	$request->getEmitter()->attach($mock);
	$request->getEmitter()->detach($mock);
	```

	Use the `on()` method to add a listener rather than the `addListener()` method.

	```php
	// 3.x
	$request->getEventDispatcher()->addListener('foo', function (Event $event) { /* ... */ } );
	// 4.x
	$request->getEmitter()->on('foo', function (Event $event, $name) { /* ... */ } );
	```

	## Http

	### General changes

	- The cacert.pem certificate has been moved to `src/cacert.pem`.
	- Added the concept of adapters that are used to transfer requests over the
	wire.
	- Simplified the event system.
	- Sending requests in parallel is still possible, but batching is no longer a
	concept of the HTTP layer. Instead, you must use the `complete` and `error`
	events to asynchronously manage parallel request transfers.
	- `Guzzle\Http\Url` has moved to `GuzzleHttp\Url`.
	- `Guzzle\Http\QueryString` has moved to `GuzzleHttp\Query`.
	- QueryAggregators have been rewritten so that they are simply callable
	functions.
	- `GuzzleHttp\StaticClient` has been removed. Use the functions provided in
	`functions.php` for an easy to use static client instance.
	- Exceptions in `GuzzleHttp\Exception` have been updated to all extend from
	`GuzzleHttp\Exception\TransferException`.

	### Client

	Calling methods like `get()`, `post()`, `head()`, etc. no longer create and
	return a request, but rather creates a request, sends the request, and returns
	the response.

	```php
	// 3.0
	$request = $client->get('/');
	$response = $request->send();

	// 4.0
	$response = $client->get('/');

	// or, to mirror the previous behavior
	$request = $client->createRequest('GET', '/');
	$response = $client->send($request);
	```

	`GuzzleHttp\ClientInterface` has changed.

	- The `send` method no longer accepts more than one request. Use `sendAll` to
	send multiple requests in parallel.
	- `setUserAgent()` has been removed. Use a default request option instead. You
	could, for example, do something like:
	`$client->setConfig('defaults/headers/User-Agent', 'Foo/Bar ' . $client::getDefaultUserAgent())`.
	- `setSslVerification()` has been removed. Use default request options instead,
	like `$client->setConfig('defaults/verify', true)`.

	`GuzzleHttp\Client` has changed.

	- The constructor now accepts only an associative array. You can include a
	`base_url` string or array to use a URI template as the base URL of a client.
	You can also specify a `defaults` key that is an associative array of default
	request options. You can pass an `adapter` to use a custom adapter,
	`batch_adapter` to use a custom adapter for sending requests in parallel, or
	a `message_factory` to change the factory used to create HTTP requests and
	responses.
	- The client no longer emits a `client.create_request` event.
	- Creating requests with a client no longer automatically utilize a URI
	template. You must pass an array into a creational method (e.g.,
	`createRequest`, `get`, `put`, etc.) in order to expand a URI template.

	### Messages

	Messages no longer have references to their counterparts (i.e., a request no
	longer has a reference to it's response, and a response no loger has a
	reference to its request). This association is now managed through a
	`GuzzleHttp\Adapter\TransactionInterface` object. You can get references to
	these transaction objects using request events that are emitted over the
	lifecycle of a request.

	#### Requests with a body

	- `GuzzleHttp\Message\EntityEnclosingRequest` and
	`GuzzleHttp\Message\EntityEnclosingRequestInterface` have been removed. The
	separation between requests that contain a body and requests that do not
	contain a body has been removed, and now `GuzzleHttp\Message\RequestInterface`
	handles both use cases.
	- Any method that previously accepts a `GuzzleHttp\Response` object now accept a
	`GuzzleHttp\Message\ResponseInterface`.
	- `GuzzleHttp\Message\RequestFactoryInterface` has been renamed to
	`GuzzleHttp\Message\MessageFactoryInterface`. This interface is used to create
	both requests and responses and is implemented in
	`GuzzleHttp\Message\MessageFactory`.
	- POST field and file methods have been removed from the request object. You
	must now use the methods made available to `GuzzleHttp\Post\PostBodyInterface`
	to control the format of a POST body. Requests that are created using a
	standard `GuzzleHttp\Message\MessageFactoryInterface` will automatically use
	a `GuzzleHttp\Post\PostBody` body if the body was passed as an array or if
	the method is POST and no body is provided.

	```php
	$request = $client->createRequest('POST', '/');
	$request->getBody()->setField('foo', 'bar');
	$request->getBody()->addFile(new PostFile('file_key', fopen('/path/to/content', 'r')));
	```

	#### Headers

	- `GuzzleHttp\Message\Header` has been removed. Header values are now simply
	represented by an array of values or as a string. Header values are returned
	as a string by default when retrieving a header value from a message. You can
	pass an optional argument of `true` to retrieve a header value as an array
	of strings instead of a single concatenated string.
	- `GuzzleHttp\PostFile` and `GuzzleHttp\PostFileInterface` have been moved to
	`GuzzleHttp\Post`. This interface has been simplified and now allows the
	addition of arbitrary headers.
	- Custom headers like `GuzzleHttp\Message\Header\Link` have been removed. Most
	of the custom headers are now handled separately in specific
	subscribers/plugins, and `GuzzleHttp\Message\HeaderValues::parseParams()` has
	been updated to properly handle headers that contain parameters (like the
	`Link` header).

	#### Responses

	- `GuzzleHttp\Message\Response::getInfo()` and
	`GuzzleHttp\Message\Response::setInfo()` have been removed. Use the event
	system to retrieve this type of information.
	- `GuzzleHttp\Message\Response::getRawHeaders()` has been removed.
	- `GuzzleHttp\Message\Response::getMessage()` has been removed.
	- `GuzzleHttp\Message\Response::calculateAge()` and other cache specific
	methods have moved to the CacheSubscriber.
	- Header specific helper functions like `getContentMd5()` have been removed.
	Just use `getHeader('Content-MD5')` instead.
	- `GuzzleHttp\Message\Response::setRequest()` and
	`GuzzleHttp\Message\Response::getRequest()` have been removed. Use the event
	system to work with request and response objects as a transaction.
	- `GuzzleHttp\Message\Response::getRedirectCount()` has been removed. Use the
	Redirect subscriber instead.
	- `GuzzleHttp\Message\Response::isSuccessful()` and other related methods have
	been removed. Use `getStatusCode()` instead.

	#### Streaming responses

	Streaming requests can now be created by a client directly, returning a
	`GuzzleHttp\Message\ResponseInterface` object that contains a body stream
	referencing an open PHP HTTP stream.

	```php
	// 3.0
	use Guzzle\Stream\PhpStreamRequestFactory;
	$request = $client->get('/');
	$factory = new PhpStreamRequestFactory();
	$stream = $factory->fromRequest($request);
	$data = $stream->read(1024);

	// 4.0
	$response = $client->get('/', ['stream' => true]);
	// Read some data off of the stream in the response body
	$data = $response->getBody()->read(1024);
	```

	#### Redirects

	The `configureRedirects()` method has been removed in favor of a
	`allow_redirects` request option.

	```php
	// Standard redirects with a default of a max of 5 redirects
	$request = $client->createRequest('GET', '/', ['allow_redirects' => true]);

	// Strict redirects with a custom number of redirects
	$request = $client->createRequest('GET', '/', [
	'allow_redirects' => ['max' => 5, 'strict' => true]
	]);
	```

	#### EntityBody

	EntityBody interfaces and classes have been removed or moved to
	`GuzzleHttp\Stream`. All classes and interfaces that once required
	`GuzzleHttp\EntityBodyInterface` now require
	`GuzzleHttp\Stream\StreamInterface`. Creating a new body for a request no
	longer uses `GuzzleHttp\EntityBody::factory` but now uses
	`GuzzleHttp\Stream\Stream::factory` or even better:
	`GuzzleHttp\Stream\create()`.

	- `Guzzle\Http\EntityBodyInterface` is now `GuzzleHttp\Stream\StreamInterface`
	- `Guzzle\Http\EntityBody` is now `GuzzleHttp\Stream\Stream`
	- `Guzzle\Http\CachingEntityBody` is now `GuzzleHttp\Stream\CachingStream`
	- `Guzzle\Http\ReadLimitEntityBody` is now `GuzzleHttp\Stream\LimitStream`
	- `Guzzle\Http\IoEmittyinEntityBody` has been removed.

	#### Request lifecycle events

	Requests previously submitted a large number of requests. The number of events
	emitted over the lifecycle of a request has been significantly reduced to make
	it easier to understand how to extend the behavior of a request. All events
	emitted during the lifecycle of a request now emit a custom
	`GuzzleHttp\Event\EventInterface` object that contains context providing
	methods and a way in which to modify the transaction at that specific point in
	time (e.g., intercept the request and set a response on the transaction).

	- `request.before_send` has been renamed to `before` and now emits a
	`GuzzleHttp\Event\BeforeEvent`
	- `request.complete` has been renamed to `complete` and now emits a
	`GuzzleHttp\Event\CompleteEvent`.
	- `request.sent` has been removed. Use `complete`.
	- `request.success` has been removed. Use `complete`.
	- `error` is now an event that emits a `GuzzleHttp\Event\ErrorEvent`.
	- `request.exception` has been removed. Use `error`.
	- `request.receive.status_line` has been removed.
	- `curl.callback.progress` has been removed. Use a custom `StreamInterface` to
	maintain a status update.
	- `curl.callback.write` has been removed. Use a custom `StreamInterface` to
	intercept writes.
	- `curl.callback.read` has been removed. Use a custom `StreamInterface` to
	intercept reads.

	`headers` is a new event that is emitted after the response headers of a
	request have been received before the body of the response is downloaded. This
	event emits a `GuzzleHttp\Event\HeadersEvent`.

	You can intercept a request and inject a response using the `intercept()` event
	of a `GuzzleHttp\Event\BeforeEvent`, `GuzzleHttp\Event\CompleteEvent`, and
	`GuzzleHttp\Event\ErrorEvent` event.

	See: https://docs.guzzlephp.org/en/latest/events.html

	## Inflection

	The `Guzzle\Inflection` namespace has been removed. This is not a core concern
	of Guzzle.

	## Iterator

	The `Guzzle\Iterator` namespace has been removed.

	- `Guzzle\Iterator\AppendIterator`, `Guzzle\Iterator\ChunkedIterator`, and
	`Guzzle\Iterator\MethodProxyIterator` are nice, but not a core requirement of
	Guzzle itself.
	- `Guzzle\Iterator\FilterIterator` is no longer needed because an equivalent
	class is shipped with PHP 5.4.
	- `Guzzle\Iterator\MapIterator` is not really needed when using PHP 5.5 because
	it's easier to just wrap an iterator in a generator that maps values.

	For a replacement of these iterators, see https://github.com/nikic/iter

	## Log

	The LogPlugin has moved to https://github.com/guzzle/log-subscriber. The
	`Guzzle\Log` namespace has been removed. Guzzle now relies on
	`Psr\Log\LoggerInterface` for all logging. The MessageFormatter class has been
	moved to `GuzzleHttp\Subscriber\Log\Formatter`.

	## Parser

	The `Guzzle\Parser` namespace has been removed. This was previously used to
	make it possible to plug in custom parsers for cookies, messages, URI
	templates, and URLs; however, this level of complexity is not needed in Guzzle
	so it has been removed.

	- Cookie: Cookie parsing logic has been moved to
	`GuzzleHttp\Cookie\SetCookie::fromString`.
	- Message: Message parsing logic for both requests and responses has been moved
	to `GuzzleHttp\Message\MessageFactory::fromMessage`. Message parsing is only
	used in debugging or deserializing messages, so it doesn't make sense for
	Guzzle as a library to add this level of complexity to parsing messages.
	- UriTemplate: URI template parsing has been moved to
	`GuzzleHttp\UriTemplate`. The Guzzle library will automatically use the PECL
	URI template library if it is installed.
	- Url: URL parsing is now performed in `GuzzleHttp\Url::fromString` (previously
	it was `Guzzle\Http\Url::factory()`). If custom URL parsing is necessary,
	then developers are free to subclass `GuzzleHttp\Url`.

	## Plugin

	The `Guzzle\Plugin` namespace has been renamed to `GuzzleHttp\Subscriber`.
	Several plugins are shipping with the core Guzzle library under this namespace.

	- `GuzzleHttp\Subscriber\Cookie`: Replaces the old CookiePlugin. Cookie jar
	code has moved to `GuzzleHttp\Cookie`.
	- `GuzzleHttp\Subscriber\History`: Replaces the old HistoryPlugin.
	- `GuzzleHttp\Subscriber\HttpError`: Throws errors when a bad HTTP response is
	received.
	- `GuzzleHttp\Subscriber\Mock`: Replaces the old MockPlugin.
	- `GuzzleHttp\Subscriber\Prepare`: Prepares the body of a request just before
	sending. This subscriber is attached to all requests by default.
	- `GuzzleHttp\Subscriber\Redirect`: Replaces the RedirectPlugin.

	The following plugins have been removed (third-parties are free to re-implement
	these if needed):

	- `GuzzleHttp\Plugin\Async` has been removed.
	- `GuzzleHttp\Plugin\CurlAuth` has been removed.
	- `GuzzleHttp\Plugin\ErrorResponse\ErrorResponsePlugin` has been removed. This
	functionality should instead be implemented with event listeners that occur
	after normal response parsing occurs in the guzzle/command package.

	The following plugins are not part of the core Guzzle package, but are provided
	in separate repositories:

	- `Guzzle\Http\Plugin\BackoffPlugin` has been rewritten to be much simpler
	to build custom retry policies using simple functions rather than various
	chained classes. See: https://github.com/guzzle/retry-subscriber
	- `Guzzle\Http\Plugin\Cache\CachePlugin` has moved to
	https://github.com/guzzle/cache-subscriber
	- `Guzzle\Http\Plugin\Log\LogPlugin` has moved to
	https://github.com/guzzle/log-subscriber
	- `Guzzle\Http\Plugin\Md5\Md5Plugin` has moved to
	https://github.com/guzzle/message-integrity-subscriber
	- `Guzzle\Http\Plugin\Mock\MockPlugin` has moved to
	`GuzzleHttp\Subscriber\MockSubscriber`.
	- `Guzzle\Http\Plugin\Oauth\OauthPlugin` has moved to
	https://github.com/guzzle/oauth-subscriber

	## Service

	The service description layer of Guzzle has moved into two separate packages:

	- https://github.com/guzzle/command Provides a high level abstraction over web
	services by representing web service operations using commands.
	- https://github.com/guzzle/guzzle-services Provides an implementation of
	guzzle/command that provides request serialization and response parsing using
	Guzzle service descriptions.

	## Stream

	Stream have moved to a separate package available at
	https://github.com/guzzle/streams.

	`Guzzle\Stream\StreamInterface` has been given a large update to cleanly take
	on the responsibilities of `Guzzle\Http\EntityBody` and
	`Guzzle\Http\EntityBodyInterface` now that they have been removed. The number
	of methods implemented by the `StreamInterface` has been drastically reduced to
	allow developers to more easily extend and decorate stream behavior.

	## Removed methods from StreamInterface

	- `getStream` and `setStream` have been removed to better encapsulate streams.
	- `getMetadata` and `setMetadata` have been removed in favor of
	`GuzzleHttp\Stream\MetadataStreamInterface`.
	- `getWrapper`, `getWrapperData`, `getStreamType`, and `getUri` have all been
	removed. This data is accessible when
	using streams that implement `GuzzleHttp\Stream\MetadataStreamInterface`.
	- `rewind` has been removed. Use `seek(0)` for a similar behavior.

	## Renamed methods

	- `detachStream` has been renamed to `detach`.
	- `feof` has been renamed to `eof`.
	- `ftell` has been renamed to `tell`.
	- `readLine` has moved from an instance method to a static class method of
	`GuzzleHttp\Stream\Stream`.

	## Metadata streams

	`GuzzleHttp\Stream\MetadataStreamInterface` has been added to denote streams
	that contain additional metadata accessible via `getMetadata()`.
	`GuzzleHttp\Stream\StreamInterface::getMetadata` and
	`GuzzleHttp\Stream\StreamInterface::setMetadata` have been removed.

	## StreamRequestFactory

	The entire concept of the StreamRequestFactory has been removed. The way this
	was used in Guzzle 3 broke the actual interface of sending streaming requests
	(instead of getting back a Response, you got a StreamInterface). Streaming
	PHP requests are now implemented through the `GuzzleHttp\Adapter\StreamAdapter`.

	3.6 to 3.7
	----------

	### Deprecations

	- You can now enable E_USER_DEPRECATED warnings to see if you are using any deprecated methods.:

	```php
	\Guzzle\Common\Version::$emitWarnings = true;
	```

	The following APIs and options have been marked as deprecated:

	- Marked `Guzzle\Http\Message\Request::isResponseBodyRepeatable()` as deprecated. Use `$request->getResponseBody()->isRepeatable()` instead.
	- Marked `Guzzle\Http\Message\Request::canCache()` as deprecated. Use `Guzzle\Plugin\Cache\DefaultCanCacheStrategy->canCacheRequest()` instead.
	- Marked `Guzzle\Http\Message\Request::canCache()` as deprecated. Use `Guzzle\Plugin\Cache\DefaultCanCacheStrategy->canCacheRequest()` instead.
	- Marked `Guzzle\Http\Message\Request::setIsRedirect()` as deprecated. Use the HistoryPlugin instead.
	- Marked `Guzzle\Http\Message\Request::isRedirect()` as deprecated. Use the HistoryPlugin instead.
	- Marked `Guzzle\Cache\CacheAdapterFactory::factory()` as deprecated
	- Marked `Guzzle\Service\Client::enableMagicMethods()` as deprecated. Magic methods can no longer be disabled on a Guzzle\Service\Client.
	- Marked `Guzzle\Parser\Url\UrlParser` as deprecated. Just use PHP's `parse_url()` and percent encode your UTF-8.
	- Marked `Guzzle\Common\Collection::inject()` as deprecated.
	- Marked `Guzzle\Plugin\CurlAuth\CurlAuthPlugin` as deprecated. Use
	`$client->getConfig()->setPath('request.options/auth', array('user', 'pass', 'Basic\|Digest\|NTLM\|Any'));` or
	`$client->setDefaultOption('auth', array('user', 'pass', 'Basic\|Digest\|NTLM\|Any'));`

	3.7 introduces `request.options` as a parameter for a client configuration and as an optional argument to all creational
	request methods. When paired with a client's configuration settings, these options allow you to specify default settings
	for various aspects of a request. Because these options make other previous configuration options redundant, several
	configuration options and methods of a client and AbstractCommand have been deprecated.

	- Marked `Guzzle\Service\Client::getDefaultHeaders()` as deprecated. Use `$client->getDefaultOption('headers')`.
	- Marked `Guzzle\Service\Client::setDefaultHeaders()` as deprecated. Use `$client->setDefaultOption('headers/{header_name}', 'value')`.
	- Marked 'request.params' for `Guzzle\Http\Client` as deprecated. Use `$client->setDefaultOption('params/{param_name}', 'value')`
	- Marked 'command.headers', 'command.response_body' and 'command.on_complete' as deprecated for AbstractCommand. These will work through Guzzle 4.0

	$command = $client->getCommand('foo', array(
	'command.headers' => array('Test' => '123'),
	'command.response_body' => '/path/to/file'
	));

	// Should be changed to:

	$command = $client->getCommand('foo', array(
	'command.request_options' => array(
	'headers' => array('Test' => '123'),
	'save_as' => '/path/to/file'
	)
	));

	### Interface changes

	Additions and changes (you will need to update any implementations or subclasses you may have created):

	- Added an `$options` argument to the end of the following methods of `Guzzle\Http\ClientInterface`:
	createRequest, head, delete, put, patch, post, options, prepareRequest
	- Added an `$options` argument to the end of `Guzzle\Http\Message\Request\RequestFactoryInterface::createRequest()`
	- Added an `applyOptions()` method to `Guzzle\Http\Message\Request\RequestFactoryInterface`
	- Changed `Guzzle\Http\ClientInterface::get($uri = null, $headers = null, $body = null)` to
	`Guzzle\Http\ClientInterface::get($uri = null, $headers = null, $options = array())`. You can still pass in a
	resource, string, or EntityBody into the $options parameter to specify the download location of the response.
	- Changed `Guzzle\Common\Collection::__construct($data)` to no longer accepts a null value for `$data` but a
	default `array()`
	- Added `Guzzle\Stream\StreamInterface::isRepeatable`
	- Made `Guzzle\Http\Client::expandTemplate` and `getUriTemplate` protected methods.

	The following methods were removed from interfaces. All of these methods are still available in the concrete classes
	that implement them, but you should update your code to use alternative methods:

	- Removed `Guzzle\Http\ClientInterface::setDefaultHeaders(). Use
	`$client->getConfig()->setPath('request.options/headers/{header_name}', 'value')`. or
	`$client->getConfig()->setPath('request.options/headers', array('header_name' => 'value'))` or
	`$client->setDefaultOption('headers/{header_name}', 'value')`. or
	`$client->setDefaultOption('headers', array('header_name' => 'value'))`.
	- Removed `Guzzle\Http\ClientInterface::getDefaultHeaders(). Use `$client->getConfig()->getPath('request.options/headers')`.
	- Removed `Guzzle\Http\ClientInterface::expandTemplate()`. This is an implementation detail.
	- Removed `Guzzle\Http\ClientInterface::setRequestFactory()`. This is an implementation detail.
	- Removed `Guzzle\Http\ClientInterface::getCurlMulti()`. This is a very specific implementation detail.
	- Removed `Guzzle\Http\Message\RequestInterface::canCache`. Use the CachePlugin.
	- Removed `Guzzle\Http\Message\RequestInterface::setIsRedirect`. Use the HistoryPlugin.
	- Removed `Guzzle\Http\Message\RequestInterface::isRedirect`. Use the HistoryPlugin.

	### Cache plugin breaking changes

	- CacheKeyProviderInterface and DefaultCacheKeyProvider are no longer used. All of this logic is handled in a
	CacheStorageInterface. These two objects and interface will be removed in a future version.
	- Always setting X-cache headers on cached responses
	- Default cache TTLs are now handled by the CacheStorageInterface of a CachePlugin
	- `CacheStorageInterface::cache($key, Response $response, $ttl = null)` has changed to `cache(RequestInterface
	$request, Response $response);`
	- `CacheStorageInterface::fetch($key)` has changed to `fetch(RequestInterface $request);`
	- `CacheStorageInterface::delete($key)` has changed to `delete(RequestInterface $request);`
	- Added `CacheStorageInterface::purge($url)`
	- `DefaultRevalidation::__construct(CacheKeyProviderInterface $cacheKey, CacheStorageInterface $cache, CachePlugin
	$plugin)` has changed to `DefaultRevalidation::__construct(CacheStorageInterface $cache,
	CanCacheStrategyInterface $canCache = null)`
	- Added `RevalidationInterface::shouldRevalidate(RequestInterface $request, Response $response)`

	3.5 to 3.6
	----------

	* Mixed casing of headers are now forced to be a single consistent casing across all values for that header.
	* Messages internally use a HeaderCollection object to delegate handling case-insensitive header resolution
	* Removed the whole changedHeader() function system of messages because all header changes now go through addHeader().
	For example, setHeader() first removes the header using unset on a HeaderCollection and then calls addHeader().
	Keeping the Host header and URL host in sync is now handled by overriding the addHeader method in Request.
	* Specific header implementations can be created for complex headers. When a message creates a header, it uses a
	HeaderFactory which can map specific headers to specific header classes. There is now a Link header and
	CacheControl header implementation.
	* Moved getLinks() from Response to just be used on a Link header object.

	If you previously relied on Guzzle\Http\Message\Header::raw(), then you will need to update your code to use the
	HeaderInterface (e.g. toArray(), getAll(), etc.).

	### Interface changes

	* Removed from interface: Guzzle\Http\ClientInterface::setUriTemplate
	* Removed from interface: Guzzle\Http\ClientInterface::setCurlMulti()
	* Removed Guzzle\Http\Message\Request::receivedRequestHeader() and implemented this functionality in
	Guzzle\Http\Curl\RequestMediator
	* Removed the optional $asString parameter from MessageInterface::getHeader(). Just cast the header to a string.
	* Removed the optional $tryChunkedTransfer option from Guzzle\Http\Message\EntityEnclosingRequestInterface
	* Removed the $asObjects argument from Guzzle\Http\Message\MessageInterface::getHeaders()

	### Removed deprecated functions

	* Removed Guzzle\Parser\ParserRegister::get(). Use getParser()
	* Removed Guzzle\Parser\ParserRegister::set(). Use registerParser().

	### Deprecations

	* The ability to case-insensitively search for header values
	* Guzzle\Http\Message\Header::hasExactHeader
	* Guzzle\Http\Message\Header::raw. Use getAll()
	* Deprecated cache control specific methods on Guzzle\Http\Message\AbstractMessage. Use the CacheControl header object
	instead.

	### Other changes

	* All response header helper functions return a string rather than mixing Header objects and strings inconsistently
	* Removed cURL blacklist support. This is no longer necessary now that Expect, Accept, etc. are managed by Guzzle
	directly via interfaces
	* Removed the injecting of a request object onto a response object. The methods to get and set a request still exist
	but are a no-op until removed.
	* Most classes that used to require a `Guzzle\Service\Command\CommandInterface` typehint now request a
	`Guzzle\Service\Command\ArrayCommandInterface`.
	* Added `Guzzle\Http\Message\RequestInterface::startResponse()` to the RequestInterface to handle injecting a response
	on a request while the request is still being transferred
	* `Guzzle\Service\Command\CommandInterface` now extends from ToArrayInterface and ArrayAccess

	3.3 to 3.4
	----------

	Base URLs of a client now follow the rules of https://datatracker.ietf.org/doc/html/rfc3986#section-5.2.2 when merging URLs.

	3.2 to 3.3
	----------

	### Response::getEtag() quote stripping removed

	`Guzzle\Http\Message\Response::getEtag()` no longer strips quotes around the ETag response header

	### Removed `Guzzle\Http\Utils`

	The `Guzzle\Http\Utils` class was removed. This class was only used for testing.

	### Stream wrapper and type

	`Guzzle\Stream\Stream::getWrapper()` and `Guzzle\Stream\Stream::getStreamType()` are no longer converted to lowercase.

	### curl.emit_io became emit_io

	Emitting IO events from a RequestMediator is now a parameter that must be set in a request's curl options using the
	'emit_io' key. This was previously set under a request's parameters using 'curl.emit_io'

	3.1 to 3.2
	----------

	### CurlMulti is no longer reused globally

	Before 3.2, the same CurlMulti object was reused globally for each client. This can cause issue where plugins added
	to a single client can pollute requests dispatched from other clients.

	If you still wish to reuse the same CurlMulti object with each client, then you can add a listener to the
	ServiceBuilder's `service_builder.create_client` event to inject a custom CurlMulti object into each client as it is
	created.

	```php
	$multi = new Guzzle\Http\Curl\CurlMulti();
	$builder = Guzzle\Service\Builder\ServiceBuilder::factory('/path/to/config.json');
	$builder->addListener('service_builder.create_client', function ($event) use ($multi) {
	$event['client']->setCurlMulti($multi);
	}
	});
	```

	### No default path

	URLs no longer have a default path value of '/' if no path was specified.

	Before:

	```php
	$request = $client->get('http://www.foo.com');
	echo $request->getUrl();
	// >> http://www.foo.com/
	```

	After:

	```php
	$request = $client->get('http://www.foo.com');
	echo $request->getUrl();
	// >> http://www.foo.com
	```

	### Less verbose BadResponseException

	The exception message for `Guzzle\Http\Exception\BadResponseException` no longer contains the full HTTP request and
	response information. You can, however, get access to the request and response object by calling `getRequest()` or
	`getResponse()` on the exception object.

	### Query parameter aggregation

	Multi-valued query parameters are no longer aggregated using a callback function. `Guzzle\Http\Query` now has a
	setAggregator() method that accepts a `Guzzle\Http\QueryAggregator\QueryAggregatorInterface` object. This object is
	responsible for handling the aggregation of multi-valued query string variables into a flattened hash.

	2.8 to 3.x
	----------

	### Guzzle\Service\Inspector

	Change `\Guzzle\Service\Inspector::fromConfig` to `\Guzzle\Common\Collection::fromConfig`

	Before

	```php
	use Guzzle\Service\Inspector;

	class YourClient extends \Guzzle\Service\Client
	{
	public static function factory($config = array())
	{
	$default = array();
	$required = array('base_url', 'username', 'api_key');
	$config = Inspector::fromConfig($config, $default, $required);

	$client = new self(
	$config->get('base_url'),
	$config->get('username'),
	$config->get('api_key')
	);
	$client->setConfig($config);

	$client->setDescription(ServiceDescription::factory(__DIR__ . DIRECTORY_SEPARATOR . 'client.json'));

	return $client;
	}
	```

	After

	```php
	use Guzzle\Common\Collection;

	class YourClient extends \Guzzle\Service\Client
	{
	public static function factory($config = array())
	{
	$default = array();
	$required = array('base_url', 'username', 'api_key');
	$config = Collection::fromConfig($config, $default, $required);

	$client = new self(
	$config->get('base_url'),
	$config->get('username'),
	$config->get('api_key')
	);
	$client->setConfig($config);

	$client->setDescription(ServiceDescription::factory(__DIR__ . DIRECTORY_SEPARATOR . 'client.json'));

	return $client;
	}
	```

	### Convert XML Service Descriptions to JSON

	Before

	```xml
	<?xml version="1.0" encoding="UTF-8"?>
	<client>
	<commands>
	<!-- Groups -->
	<command name="list_groups" method="GET" uri="groups.json">
	<doc>Get a list of groups</doc>
	</command>
	<command name="search_groups" method="GET" uri='search.json?query="{{query}} type:group"'>
	<doc>Uses a search query to get a list of groups</doc>
	<param name="query" type="string" required="true" />
	</command>
	<command name="create_group" method="POST" uri="groups.json">
	<doc>Create a group</doc>
	<param name="data" type="array" location="body" filters="json_encode" doc="Group JSON"/>
	<param name="Content-Type" location="header" static="application/json"/>
	</command>
	<command name="delete_group" method="DELETE" uri="groups/{{id}}.json">
	<doc>Delete a group by ID</doc>
	<param name="id" type="integer" required="true"/>
	</command>
	<command name="get_group" method="GET" uri="groups/{{id}}.json">
	<param name="id" type="integer" required="true"/>
	</command>
	<command name="update_group" method="PUT" uri="groups/{{id}}.json">
	<doc>Update a group</doc>
	<param name="id" type="integer" required="true"/>
	<param name="data" type="array" location="body" filters="json_encode" doc="Group JSON"/>
	<param name="Content-Type" location="header" static="application/json"/>
	</command>
	</commands>
	</client>
	```

	After

	```json
	{
	"name": "Zendesk REST API v2",
	"apiVersion": "2012-12-31",
	"description":"Provides access to Zendesk views, groups, tickets, ticket fields, and users",
	"operations": {
	"list_groups": {
	"httpMethod":"GET",
	"uri": "groups.json",
	"summary": "Get a list of groups"
	},
	"search_groups":{
	"httpMethod":"GET",
	"uri": "search.json?query=\"{query} type:group\"",
	"summary": "Uses a search query to get a list of groups",
	"parameters":{
	"query":{
	"location": "uri",
	"description":"Zendesk Search Query",
	"type": "string",
	"required": true
	}
	}
	},
	"create_group": {
	"httpMethod":"POST",
	"uri": "groups.json",
	"summary": "Create a group",
	"parameters":{
	"data": {
	"type": "array",
	"location": "body",
	"description":"Group JSON",
	"filters": "json_encode",
	"required": true
	},
	"Content-Type":{
	"type": "string",
	"location":"header",
	"static": "application/json"
	}
	}
	},
	"delete_group": {
	"httpMethod":"DELETE",
	"uri": "groups/{id}.json",
	"summary": "Delete a group",
	"parameters":{
	"id":{
	"location": "uri",
	"description":"Group to delete by ID",
	"type": "integer",
	"required": true
	}
	}
	},
	"get_group": {
	"httpMethod":"GET",
	"uri": "groups/{id}.json",
	"summary": "Get a ticket",
	"parameters":{
	"id":{
	"location": "uri",
	"description":"Group to get by ID",
	"type": "integer",
	"required": true
	}
	}
	},
	"update_group": {
	"httpMethod":"PUT",
	"uri": "groups/{id}.json",
	"summary": "Update a group",
	"parameters":{
	"id": {
	"location": "uri",
	"description":"Group to update by ID",
	"type": "integer",
	"required": true
	},
	"data": {
	"type": "array",
	"location": "body",
	"description":"Group JSON",
	"filters": "json_encode",
	"required": true
	},
	"Content-Type":{
	"type": "string",
	"location":"header",
	"static": "application/json"
	}
	}
	}
	}
	```

	### Guzzle\Service\Description\ServiceDescription

	Commands are now called Operations

	Before

	```php
	use Guzzle\Service\Description\ServiceDescription;

	$sd = new ServiceDescription();
	$sd->getCommands(); // @returns ApiCommandInterface[]
	$sd->hasCommand($name);
	$sd->getCommand($name); // @returns ApiCommandInterface\|null
	$sd->addCommand($command); // @param ApiCommandInterface $command
	```

	After

	```php
	use Guzzle\Service\Description\ServiceDescription;

	$sd = new ServiceDescription();
	$sd->getOperations(); // @returns OperationInterface[]
	$sd->hasOperation($name);
	$sd->getOperation($name); // @returns OperationInterface\|null
	$sd->addOperation($operation); // @param OperationInterface $operation
	```

	### Guzzle\Common\Inflection\Inflector

	Namespace is now `Guzzle\Inflection\Inflector`

	### Guzzle\Http\Plugin

	Namespace is now `Guzzle\Plugin`. Many other changes occur within this namespace and are detailed in their own sections below.

	### Guzzle\Http\Plugin\LogPlugin and Guzzle\Common\Log

	Now `Guzzle\Plugin\Log\LogPlugin` and `Guzzle\Log` respectively.

	Before

	```php
	use Guzzle\Common\Log\ClosureLogAdapter;
	use Guzzle\Http\Plugin\LogPlugin;

	/** @var \Guzzle\Http\Client */
	$client;

	// $verbosity is an integer indicating desired message verbosity level
	$client->addSubscriber(new LogPlugin(new ClosureLogAdapter(function($m) { echo $m; }, $verbosity = LogPlugin::LOG_VERBOSE);
	```

	After

	```php
	use Guzzle\Log\ClosureLogAdapter;
	use Guzzle\Log\MessageFormatter;
	use Guzzle\Plugin\Log\LogPlugin;

	/** @var \Guzzle\Http\Client */
	$client;

	// $format is a string indicating desired message format -- @see MessageFormatter
	$client->addSubscriber(new LogPlugin(new ClosureLogAdapter(function($m) { echo $m; }, $format = MessageFormatter::DEBUG_FORMAT);
	```

	### Guzzle\Http\Plugin\CurlAuthPlugin

	Now `Guzzle\Plugin\CurlAuth\CurlAuthPlugin`.

	### Guzzle\Http\Plugin\ExponentialBackoffPlugin

	Now `Guzzle\Plugin\Backoff\BackoffPlugin`, and other changes.

	Before

	```php
	use Guzzle\Http\Plugin\ExponentialBackoffPlugin;

	$backoffPlugin = new ExponentialBackoffPlugin($maxRetries, array_merge(
	ExponentialBackoffPlugin::getDefaultFailureCodes(), array(429)
	));

	$client->addSubscriber($backoffPlugin);
	```

	After

	```php
	use Guzzle\Plugin\Backoff\BackoffPlugin;
	use Guzzle\Plugin\Backoff\HttpBackoffStrategy;

	// Use convenient factory method instead -- see implementation for ideas of what
	// you can do with chaining backoff strategies
	$backoffPlugin = BackoffPlugin::getExponentialBackoff($maxRetries, array_merge(
	HttpBackoffStrategy::getDefaultFailureCodes(), array(429)
	));
	$client->addSubscriber($backoffPlugin);
	```

	### Known Issues

	#### [BUG] Accept-Encoding header behavior changed unintentionally.

	(See #217) (Fixed in 09daeb8c666fb44499a0646d655a8ae36456575e)

	In version 2.8 setting the `Accept-Encoding` header would set the CURLOPT_ENCODING option, which permitted cURL to
	properly handle gzip/deflate compressed responses from the server. In versions affected by this bug this does not happen.
	See issue #217 for a workaround, or use a version containing the fix.

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