do not reject uppercased HTTP method names

Author: xabbuh

CHANGELOG.md

@@ -4,6 +4,10 @@ CHANGELOG
 0.3.0
 -----
 
+* Fixed treating HTTP methods case insensitive. Rejecting uppercased HTTP
+  method names contradicts the HTTP specification. Lowercased method names
+  will still be supported to keep backwards compatibility though.
+
 * Fixed creating `XApiClient` instances in an invalid state. The `XApiClientBuilder`
   now throws a `\LogicException` when the `build()` method is called before
   a base URI was configured.

spec/Request/HandlerSpec.php

@@ -34,27 +34,31 @@ function it_returns_get_request_created_by_the_http_client(ClientInterface $clie
         $client->get('/xapi/statements')->willReturn($request);
 
         $this->createRequest('get', '/xapi/statements')->shouldReturn($request);
+        $this->createRequest('GET', '/xapi/statements')->shouldReturn($request);
     }
 
     function it_returns_post_request_created_by_the_http_client(ClientInterface $client, RequestInterface $request)
     {
         $client->post('/xapi/statements', null, 'body')->willReturn($request);
 
         $this->createRequest('post', '/xapi/statements', array(), 'body')->shouldReturn($request);
+        $this->createRequest('POST', '/xapi/statements', array(), 'body')->shouldReturn($request);
     }
 
     function it_returns_put_request_created_by_the_http_client(ClientInterface $client, RequestInterface $request)
     {
         $client->put('/xapi/statements', null, 'body')->willReturn($request);
 
         $this->createRequest('put', '/xapi/statements', array(), 'body')->shouldReturn($request);
+        $this->createRequest('PUT', '/xapi/statements', array(), 'body')->shouldReturn($request);
     }
 
     function it_returns_delete_request_created_by_the_http_client(ClientInterface $client, RequestInterface $request)
     {
         $client->delete('/xapi/statements')->willReturn($request);
 
         $this->createRequest('delete', '/xapi/statements')->shouldReturn($request);
+        $this->createRequest('DELETE', '/xapi/statements')->shouldReturn($request);
     }
 
     function it_throws_an_access_denied_exception_when_a_401_status_code_is_returned(RequestInterface $request, Response $response)

src/Request/Handler.php

@@ -57,7 +57,7 @@ public function createRequest($method, $uri, array $urlParameters = array(), $bo
             $uri .= '?'.http_build_query($urlParameters);
         }
 
-        switch ($method) {
+        switch (strtolower($method)) {
             case 'get':
                 $request = $this->httpClient->get($uri);
                 break;