gin/PR_DESCRIPTION.md

What problem does this PR solve?

Issue Number: Close #2810

Problem Summary: Users have requested an example of how to integrate json-iterator with Gin at runtime (without using build tags). While there is documentation, a runnable example project is helpful for understanding the integration points, specifically implementing the json.Core interface and replacing json.API.

What is changed and how does it work?

• Added a new example under examples/json-iterator.
• Implemented customJsonApi which wraps jsoniter.Config and implements json.Core.
• Demonstrates how to replace the default json.API with the custom implementation.
• Added a unit test to verify the integration works as expected.
• Added a README for the example explaining how to run and test it.

Check List

Tests

• Unit test
  • Added examples/json-iterator/json_iterator_test.go
• Integration test
• Manual test
  • Verified with curl locally.
• No code

Code changes

• Has the configuration change
• Has HTTP API interfaces changed
• Has persistent data change

Side effects

• Possible performance regression
• Increased code complexity
• Breaking backward compatibility

Related changes

• PR to update pingcap/docs/pingcap/docs-cn:
• PR to update pingcap/tiup:
• Need to cherry-pick to the release branch

How to Test

1. Navigate to the example directory:

   cd examples/json-iterator
   

2. Run the tests:

   go test -v
   

3. Run the example:

   go run main.go
   

4. Make a request:

   curl http://localhost:8080/ping