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I am trying to implement FPS in my application to load encrypted media content. Below are the details of my implementation for DRM FairPlay streaming: When it start playing encrypted media url in AVPlayer, it calls resouceLoader delegate method. Now in this method, first I get the Certificate data from certificate URL using simple GET call. Once it done, I request the server playback context using conent Id. So far this works well. I get the response I wanted. At last, I request the content key context from the Key Server Module. I take our server URL as request URL and we make a POST call to server. Now this call also gives us the response code 500 (Instead of 200 : Success). IMPORTANT: (Doubt) Is there any additional HTTP header value required to be pass in header param while making a request to Key Server Module. I have tried with "application/x-www-form-urlencoded" as "Content-Type" but it is not helping. Below is the response we get: { Status Code: 500, Headers { Connection = ( close ); "Content-Language" = ( en ); "Content-Length" = ( 5242 ); "Content-Type" = ( "text/html;charset=utf-8" ); Date = ( "Tue, 18 Aug 2020 05:07:32 GMT" ); Server = ( "Apache-Coyote/1.1" ); } } Error Message Log: FPS Error code = -42581 | Error in parsing Server playback context to retrieve assetId and HU. Can anyone please help me to resolve this? We're on a tight deadline and need to resolve this as soon as possible. Could anyone let me know what I am missing in this whole flow?