Add an accept header in JSON request to help 3rd party services like localstack (#1721)

Author: jderusse

CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## NOT RELEASED
 
+### Changed
+
+- Add `Accept: application/json` header in request to fix incompatibility with 3rd party providers
+
 ## 1.2.0
 
 ### Added

src/Input/GetRoleCredentialsRequest.php

@@ -89,7 +89,10 @@ public function getRoleName(): ?string
     public function request(): Request
     {
         // Prepare headers
-        $headers = ['content-type' => 'application/json'];
+        $headers = [
+            'Content-Type' => 'application/json',
+            'Accept' => 'application/json',
+        ];
         if (null === $v = $this->accessToken) {
             throw new InvalidArgument(sprintf('Missing parameter "accessToken" for "%s". The value cannot be null.', __CLASS__));
         }

tests/Unit/Input/GetRoleCredentialsRequestTest.php

@@ -18,7 +18,8 @@ public function testRequest(): void
         // see https://docs.aws.amazon.com/singlesignon/latest/PortalAPIReference/API_GetRoleCredentials.html
         $expected = '
             GET /federation/credentials?role_name=RoleName&account_id=AccountId HTTP/1.0
-            Content-Type: application/json
+            Content-type: application/json
+            Accept: application/json
             x-amz-sso_bearer_token: AccessToken
         ';