Proposal Details

Hello Go team,

I hope this message finds you well. I'm reaching out to suggest an enhancement for the httputil.ReverseProxy struct, specifically regarding its logging capabilities.

Currently, httputil.ReverseProxy allows for an ErrorLog of type *log.Logger to be specified, which it uses internally to log errors. This is incredibly useful for monitoring and debugging purposes. However, in many applications, logging is handled by more sophisticated systems than the standard log package provides, such as slog or other structured logging libraries.

This limitation means that developers must either redirect standard logger output or miss out on integrating ReverseProxy error logging with their application's central logging system. Neither of these solutions is ideal, as the former can be cumbersome and the latter can lead to fragmented logging.

Therefore, I propose adding support for custom logger interfaces that could be used in place of the standard *log.Logger. This change would allow developers to seamlessly integrate ReverseProxy logging with whatever logging system they are using, improving the flexibility and usability of the ReverseProxy for modern Go applications.

A potential approach could involve defining a simple logging interface within the httputil package that could then be implemented by any logging library. For example:

type Logger interface {
    Errorf(format string, args ...any)
}

Then, ReverseProxy could accept this interface instead of a concrete *log.Logger type, allowing for any custom implementation that matches the interface.

I believe this enhancement would significantly benefit the Go community by providing more flexibility in how errors are logged and integrated with existing systems.

Thank you for considering my suggestion. I look forward to any feedback or thoughts on this proposal.