Ok, so I know what to do here. I'm going to have three categories of error callbacks.

1. RequestErrorHandlerFunc which is invoked when there is an error unmarshaling a request, this will default to HTTP/400
2. HandlerErrorFunc, which is probably the one most interesting to users. This is called if the handler code returns an error.
3. ResponseErrorHandlerFunc, which gets called if the response serialization vistor encounters an error.

The problem with having a single callback, is that you have no idea where it was called from, so you don't have good context on how to handle that error. With these three error handler types, I think we can retain current behavior (which this PR breaks without @jamietanna 's changes) and allow for much easier error customization.

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Greptile Summary

This PR adds configurable error handling to the strict Gin server by introducing a StrictGinServerOptions struct with three handler functions (RequestErrorHandlerFunc, HandlerErrorFunc, ResponseErrorHandlerFunc), a new NewStrictHandlerWithOptions constructor, and safe defaults wired through NewStrictHandler. The generated code is correctly updated across all test fixtures.

Key changes:

• StrictGinServerOptions struct added to the Gin strict template with all three error-path callback fields.
• NewStrictHandler now initialises the struct with sensible defaults (400 for parse errors, 500 for handler/response errors) instead of writing inline.
• NewStrictHandlerWithOptions validates all three function fields for nil and falls back to the same defaults, preventing the nil-pointer dereference panics that were possible before.
• All error paths in the generated handler body (RequestErrorHandlerFunc, HandlerErrorFunc, ResponseErrorHandlerFunc) are correctly threaded through the options struct.
• The if / else if / else if response-dispatch chain remains unchanged and is structurally sound — only one branch fires per invocation.

Confidence Score: 4/5

• PR is safe to merge; the implementation is correct and the nil-pointer concern from prior review has been resolved.
• The core logic is sound: nil checks are present for all three handler functions in NewStrictHandlerWithOptions, defaults are consistent with the pre-existing inline behaviour, and return statements are in place after every early-exit error path. Score is 4 rather than 5 because the default handlers surface err.Error() verbatim in the JSON response body, which can leak internal details in production deployments — users need to supply custom handlers via NewStrictHandlerWithOptions to mitigate this.
• pkg/codegen/templates/strict/strict-gin.tmpl — review the default error response format if deploying to production.

_{Last reviewed commit: d2d8b62}

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