Maintenance Task Description

In #3533, we refactored DefaultCtx into *DefaultReq and DefaultRes. For methods that require both request and response, we use a c Ctx field to access the other methods as necessary. After this change, the benchmarks (e.g. AutoFormat) seem to report one more allocation than normal (see #3533 (comment)).

Per discussion with @ReneWerner87 on the Fiber discord, this issue suggests to update the DefaultReq and DefaultRes structs to use c *DefaultCtx to guarantee that no new allocations are made.

Impact on the Project

By addressing this issue, we can achieve our original allocation count in v2 and meet our "zero memory allocation" goal.

Additional Context (optional)

No response

Checklist:

• I have confirmed that this maintenance task is currently not being addressed.
• I understand that this task will be evaluated by the maintainers and prioritized accordingly.
• I am available to provide further information if needed.