Add automatic gzip decoding of response (php-curl-class#740)

Author: zachborboa

src/Curl/Curl.php

@@ -2124,6 +2124,8 @@ private function parseRequestHeaders($raw_headers)
      *     Returns the original raw response unless a default decoder has been set.
      *   If the response content-type cannot be determined:
      *     Returns the original raw response.
+     *   If the response content-encoding is gzip:
+     *     Returns the response gzip-decoded.
      */
     private function parseResponse($response_headers, $raw_response)
     {
@@ -2148,6 +2150,13 @@ private function parseResponse($response_headers, $raw_response)
             }
         }
 
+        if (isset($response_headers['Content-Encoding']) && $response_headers['Content-Encoding'] === 'gzip') {
+            $decoded_response = gzdecode($response);
+            if ($decoded_response !== false) {
+                $response = $decoded_response;
+            }
+        }
+
         return $response;
     }
 

tests/PHPCurlClass/PHPCurlClassTest.php

@@ -4385,4 +4385,15 @@ public function testBeforeSendEachRequest()
         $this->assertEquals(5, $test->curl->retries);
         $this->assertFalse($test->curl->error);
     }
+
+    public function testGzipDecoding()
+    {
+        $test = new Test();
+        $test->server('json_response', 'POST', [
+            'key' => 'content-encoding',
+            'value' => 'gzip',
+            'body' => gzencode('hello'),
+        ]);
+        $this->assertEquals('hello', $test->curl->response);
+    }
 }

tests/PHPCurlClass/server.php

@@ -197,16 +197,22 @@
         $value = 'application/json';
     }
 
+    if (isset($_POST['body'])) {
+        $body = $_POST['body'];
+    } else {
+        $body = json_encode([
+            'null' => null,
+            'true' => true,
+            'false' => false,
+            'integer' => 1,
+            'float' => 3.14,
+            'empty' => '',
+            'string' => 'string',
+        ]);
+    }
+
     header($key . ': ' . $value);
-    echo json_encode([
-        'null' => null,
-        'true' => true,
-        'false' => false,
-        'integer' => 1,
-        'float' => 3.14,
-        'empty' => '',
-        'string' => 'string',
-    ]);
+    echo $body;
     exit;
 } elseif ($test === 'xml_response') {
     $key = $_POST['key'];