Add default value for Accept header

Author: numerogeek

HttpClientTrait.php

@@ -56,6 +56,10 @@ private static function prepareRequest(?string $method, ?string $url, array $opt
             }
         }
 
+        if (!isset($options['normalized_headers']['accept'])) {
+            $options['normalized_headers']['accept'] = [$options['headers'][] = 'Accept: *'];
+        }
+
         if (isset($options['body'])) {
             $options['body'] = self::normalizeBody($options['body']);
         }

Tests/HttpClientTraitTest.php

@@ -172,7 +172,7 @@ public function provideRemoveDotSegments()
     public function testAuthBearerOption()
     {
         [, $options] = self::prepareRequest('POST', 'http://example.com', ['auth_bearer' => 'foobar'], HttpClientInterface::OPTIONS_DEFAULTS);
-        $this->assertSame(['Authorization: Bearer foobar'], $options['headers']);
+        $this->assertSame(['Accept: *', 'Authorization: Bearer foobar'], $options['headers']);
         $this->assertSame(['Authorization: Bearer foobar'], $options['normalized_headers']['authorization']);
     }