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Introduces the extensibility API to allow users to add custom HTTP headers to token acquisition requests (under extensibility) #5440
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                    bgavrilMS
  
              
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                src/client/Microsoft.Identity.Client/ApiConfig/AcquireTokenForClientParameterBuilder.cs
              
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Already exposed in the namespace Microsoft.Identity.Client.Advanced 
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    WithExtraHttpHeaders(IDictionary<string, string> extraHttpHeaders) method to AcquireTokenForClientParameterBuilderWithExtraHttpHeaders on AcquireTokenForClient
      WithExtraHttpHeaders on AcquireTokenForClient
              
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Fixes #5439
Changes proposed in this request
This pull request adds a comprehensive new unit test class,
ExtraHttpHeadersTests, to verify the behavior of theWithExtraHttpHeadersAPI in the token acquisition flow. The tests ensure that custom HTTP headers are correctly sent, default headers remain unaffected by null input, user headers can override defaults, and repeated calls to set headers behave as expected.New test coverage for extra HTTP headers
ExtraHttpHeadersTestsclass to validateWithExtraHttpHeadersfunctionality inAcquireTokenForClient, including scenarios for sending custom headers, listing all headers, handling null values, overriding defaults, and ensuring last call precedence.TryGetHeader,EnumerateAllHeaders, andAssertHeaderExists) to facilitate header validation and assertions within the tests.Testing
unit tests
Performance impact
none
Documentation