Guzzle Upgrade Guide
====================

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: http://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 muchs 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:

- http://github.com/guzzle/command Provides a high level abstraction over web
  services by representing web service operations using commands.
- http://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 additonal 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). Streeaming
PHP requests are now implemented throught 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 http://tools.ietf.org/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.
