Re: HTTP_ Headers from clients

["Lin Jen-Shin (godfat)" <godfat@godfat.org>]

Hi,

On Mon, Oct 24, 2016 at 4:16 PM, Olivar Plays <arne.de.herdt@gmail.com> wrote:
> Hello,
>
> I have a small question about the behaviour of Rack when it comes to headers
> send by clients.
> Are these always prefixed with HTTP_ ? Or do I need to tell my clients to
> explicitly send them as HTTP_ ?

I think according to Rack SPEC, all headers sent from client should be prefixed
with HTTP_, and if your client prefix HTTP_, then you'll end up seeing
HTTP_HTTP_ in your Rack application.

> Example, I'm checking on every request in my Rails application whether the
> HTTP_COMPANY header is present, and has the correct value.
> But I've been running into issues with detecting them.
> Right now I have the client app send the headers as COMPANY, and my Rails
> app checks as HTTP_COMPANY.

This is intended.

> Is this the intended behaviour, or will this go wrong again when the client
> suddenly submits the header as HTTP_COMPANY?
> e.g is Rack smart enough not to prefix HTTP_COMPANY with HTTTP_ again?

As stated above, if your client is sending HTTP_COMPANY, then you'll need to
access it via HTTP_HTTP_COMPANY in your Rack application. Rack should
not try to remove the prefix, otherwise HTTP_COMPANY and COMPANY
would be ambiguous.

It's designed this way to mix HTTP headers into env unambiguously.

> Kind regards,
> Arne

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