Failed to Open Stream Error with OAuth token exchange example

Question

I am following the OAuth token exchange example here running on Magento 2.4.1 on MAMP

I created an integration and copied the 4 PHP files at the root of the server. I create an integration and set it with:

Callback URL : http://magento2:8888/endpoint.php Identity link URL : http://magento2:8888/login.php

Then upon activation it opens a pop up and I click login then immediately see this error:

Fatal error: Uncaught OAuth\Common\Http\Exception\TokenResponseException: file_get_contents(http://magento2:8888/oauth/token/request): failed to open stream: HTTP request failed! HTTP/1.1 400 Bad Request in /code/MAMP/magento2/vendor/lusitanian/oauth/src/OAuth/Common/Http/Client/StreamClient.php:73 Stack trace: #0 /code/MAMP/magento2/vendor/lusitanian/oauth/src/OAuth/OAuth1/Service/AbstractService.php(52): OAuth\Common\Http\Client\StreamClient->retrieveResponse(Object(OAuth\Common\Http\Uri\Uri), '', Array) #1 /code/MAMP/magento2/checklogin.php(26): OAuth\OAuth1\Service\AbstractService->requestRequestToken() #2 {main} thrown in /code/MAMP/magento2/vendor/lusitanian/oauth/src/OAuth/Common/Http/Client/StreamClient.php on line 73

What am I missing??

Answer 1

Issue was that Authorization Header wasnt getting processed correctly by the Apache Server and had to add this to Apache config file:

SetEnvIf Authorization "(.*)" HTTP_AUTHORIZATION=$1