HTTP header ACCEPT is missing or its value is invalid – solution

Going from Beta to RTM, some things changed in the way that we retrieve values using REST in the SharePoint 2013 client object model.

Description & Solution

In the older versions of the object model, we could simply use something like this in your REST call:

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$.ajax(     {         url: SPSearchResults.url,         method: "GET",         headers:         {                 "accept": "application/json",         },         success: SPSearchResults.onSuccess,         error: SPSearchResults.onError     } );

As we can see the "headers" is specifying "application/json".

The fix is simply to swap that statement into this:

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$.ajax(     {         url: SPSearchResults.url,         method: "GET",         headers:         {                 "accept": "application/json;odata=verbose",         },         success: SPSearchResults.onSuccess,         error: SPSearchResults.onError     } );

And that’s a wrap.

Summary

I hope this can save someone a few minutes (or more) of debugging for using old example code or ripping up older projects.