[release/10.0] Revert IEndpointParameterMetadataProvider on Newtonsoft JsonPatchDocument

[Copilot]

Backport of #65559 to release/10.0

Remove IEndpointParameterMetadataProvider from Newtonsoft JsonPatchDocument types to fix content-type regression and Blazor WASM build regression

Description

The IEndpointParameterMetadataProvider added to the Newtonsoft JsonPatchDocument types in 10.0 causes two problems:

• 415 regression: Requests with application/json content type are now rejected. Previously accepted.
• Blazor WASM build break: The new Microsoft.AspNetCore.Http.Abstractions dependency fails to resolve in Blazor WASM projects.

This reverts the IEndpointParameterMetadataProvider implementation and removes the Http.Abstractions reference from the Newtonsoft package. The SystemTextJson JsonPatchDocument types are unaffected — all SystemTextJson changes are test-only.

Fixes #65325
Fixes #64330

Customer Impact

Customers using Microsoft.AspNetCore.JsonPatch with minimal APIs and MVC hit 415 responses for previously-working application/json requests. Blazor WASM projects referencing the package fail to build. Both issues have been reported by customers and block upgrades to .NET 10.

Regression?

• Yes
• No

Regressed from .NET 9.0. Introduced when IEndpointParameterMetadataProvider was added to the Newtonsoft JsonPatchDocument types in 10.0.

Risk

• High
• Medium
• Low

Straight revert of the added behavior. Restores pre-10.0 content-type handling. No impact to the SystemTextJson variant.

Verification

• Manual (required)
• Automated

New end-to-end tests verify content-type acceptance/rejection for both Newtonsoft and SystemTextJson variants. All existing tests pass (262 + 210 + 14 OpenApi).

Packaging changes reviewed?

• Yes
• No
• N/A

Removes Microsoft.AspNetCore.Http.Abstractions from the Newtonsoft JsonPatch package — correct since the interface implementation is removed.

[Copilot]

Pull request overview

Backports the fix to release/10.0 that removes IEndpointParameterMetadataProvider from the Newtonsoft-based JsonPatchDocument types to restore pre-10.0 content-type behavior (avoiding 415 for application/json) and to remove the added Http.Abstractions dependency that breaks Blazor WASM builds.

Changes:

• Remove IEndpointParameterMetadataProvider implementations from Newtonsoft JsonPatchDocument / JsonPatchDocument<T>.
• Drop the Microsoft.AspNetCore.Http.Abstractions reference from the Newtonsoft JsonPatch package project.
• Add end-to-end tests (and adjust OpenAPI tests) to validate content-type handling for Newtonsoft vs SystemTextJson variants.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
src/OpenApi/test/Microsoft.AspNetCore.OpenApi.Tests/Services/OpenApiDocumentService/OpenApiDocumentServiceTests.RequestBody.cs	Updates OpenAPI tests to ensure explicit Accepts/Consumes overrides don’t retain inferred JsonPatch media types.
src/Features/JsonPatch/test/Microsoft.AspNetCore.JsonPatch.Tests.csproj	Adds .NETCoreApp-only assembly references needed for new end-to-end tests.
src/Features/JsonPatch/test/JsonPatchContentTypeEndToEndTest.cs	Adds end-to-end coverage verifying Newtonsoft JsonPatch accepts both application/json-patch+json and application/json.
src/Features/JsonPatch/src/Microsoft.AspNetCore.JsonPatch.csproj	Removes Microsoft.AspNetCore.Http.Abstractions reference from the Newtonsoft JsonPatch package.
src/Features/JsonPatch/src/JsonPatchDocumentOfT.cs	Reverts endpoint-parameter metadata provider implementation for generic Newtonsoft JsonPatchDocument.
src/Features/JsonPatch/src/JsonPatchDocument.cs	Reverts endpoint-parameter metadata provider implementation for non-generic Newtonsoft JsonPatchDocument.
src/Features/JsonPatch.SystemTextJson/test/Microsoft.AspNetCore.JsonPatch.SystemTextJson.Tests.csproj	Adds assembly references needed for new end-to-end tests in the SystemTextJson test project.
src/Features/JsonPatch.SystemTextJson/test/JsonPatchContentTypeEndToEndTest.cs	Adds end-to-end coverage verifying SystemTextJson JsonPatch remains strict (rejects application/json).

[wtgodbe]

Approved over email