support for echo v2 engine fasthttp

[hexadecy]

There is an easy way to use echo v2 standard engine with cors.
But with the fasthttp engine, I had to create a fork and rewrite handlePreflight and handleActualRequest. It also add a dep to echo.

Do you want a PR or do I fork it?

[rs]

Would the result be free of new dep and still compat with net/http?

[hexadecy]

Still compat but only with a complete duplicate of the 2 functions, like handlePreflightEcho().
I just learned that echo will soon have a cors middleware built-in.
So I will complete it to have an alternative in case.

[jadbox]

It would be great to support Cors with plain fasthttp (without Echo).

[gaby]

@hexadecy You closed this but didn't share how it was completed?

@rs Can this be re-open? It would be awesome to have native fasthttp support

[gaby]

No worries, adding fasthttp will require adding a dependency in go.mod

[hexadecy]

@gaby sorry I didn't keep the code.
fasthttp dont have support for http2, and the fork fasthttp/http2#3 is barely alive.

[gaby]

@gaby sorry I didn't keep the code. fasthttp dont have support for http2, and the fork fasthttp/http2#3 is barely alive.

I saw your post in the fasthttp repo, someone did a fork https://github.com/lab259/cors but it's 5 years behind :-)