The type switch may not work since these http types are interfaces that may
all be satisfied by the ResponseWriter. Instead of a type switch you would
need to do a type assertion for each possible http interface.
Matt
On Tuesday, January 16, 2018 at 9:01:28 AM UTC-6, matthe...@gmail.com wrote:
>
> Can you provide some example code showing the problem?
>
> I don’t understand why you are wrapping the ResponseWriter. If you need to
> pass along metadata then wrapping makes sense, but why not just pass the
> original interface and do the type switch in each handler?
>
> type RetryResponseWriter struct {
> http.ResponseWriter
> Count uint
> …
> }
>
> func handler1(w http.ResponseWriter, r *http.Request) {
> rrw := w.(RetryResponseWriter)
> switch v := rrw.ResponseWriter.(type) {
> case http.Hijacker:
> …
> case http.Flusher:
> …
> case http.CloseNotifier:
> …
> }
> …
>
> Matt
>
> On Tuesday, January 16, 2018 at 7:53:40 AM UTC-6, Marco Jantke wrote:
>>
>> Hi everyone,
>>
>> I am currently working on a retry middleware for an http proxy. It is
>> wrapping the original response writer and only in case the forwarded
>> request should not be retried, it passes calls to `Write()`,
>> `WriteHeader()` etc directly through to the original response writer. Now I
>> am struggling with the fact, that response writers have different
>> capabilities dependent on their type. Namely they can be `Hijacker`,
>> `Flusher` or `CloseNotifier`. The problem is that my wrapper should have
>> the same capabilities as the wrapped one, but I don't see any other way
>> than creating all different types and using the proper one after doing type
>> assertions on the response writer I am wrapping. Those types would be for
>> example: `ResponseWriterWrapper`, `ResponseWriterWrapperWithFlush`,
>> `ResponseWriterWrapperWithHijack`,
>> `ResponseWriterWrapperWithHijackAndFlush`....
>>
>>
>> Does anyone have an idea how to approach this problem in a more
>> reasonable fashion?
>>
>
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