Ensure headers passed to Hackney as case-insensitive?

[tjsousa]

I've run into an issue where I'm passing headers (including a host header) coming from a Plug's connection into HTTPoison, which default to lower-case, thus causing :hackney to override the Host header (because it matches a capitalized one).

The referred use-case is for an app acting as a reverse-proxy where transparently passing headers, specially the Host header is very important.

A workaround have been suggested, which I feel would be best implemented at the httpoison lib level to avoid this issue for other users as well.

What do you guys think?

[edgurgel]

Hm.. I would open an issue to fix hackney so it looks for Host without a specific case, which seems to be the perfect solution. Would it fix the problem?

cc/ @benoitc

[tjsousa]

Yup, indeed. It seems like this existing issue could make it possible:
benoitc/hackney#114

Thanks @edgurgel !

[gosseti]

@tjsousa Just stumbled across this issue. I’m getting the error:

[error] proxy error: "HTTP/1.1 400 Bad Request\r\nContent-Type: text/plain\r\nConnection: close\r\n\r\n400 Bad Request: missing required Host header"

It’s related to the same one you’ve experienced above. Is there some way to explicitly pass the Host header to HTTPoison so that it doesn’t get overwritten/downcased by hackney? How did you solve this in the end?

I also put a StackOverflow question up here for it: http://stackoverflow.com/questions/42210304/elixir-httpoison-no-case-clause-matching-false-error

[suprafly]

Still seeing this issue.

[tcitworld]

Has there been any developments here ?

[benoitc]

@tcitworld it has been fixed in hackney. Do you still reproduce the issue?

[tcitworld]

You mean by using the hackney_headers module instead ?

[facundoolano]

Still seeing this issue (case sensitive headers) in HTTPoison. And, to be honest, having to resort to hackney_headers kind of defeats the purpose of using an Elixir wrapper library.

[benoitc]

Host header is passed once.

@facundoolano do you have any example?

[facundoolano]

@benoitc I guess my issue is more related to the title than the description. My main problem is that there's no case insensitive way to access response headers, so I need to know how the server sends them to fetch them, or manually downcase all the keys first.

[edgurgel]

Closing due to inactivity. Happy to accept a PR to get a header from HTTPoison's module