Get absolute-form request target of HTTP request using WAI

Question

The Request type provides accessors for the request method and the request version but not for the bit in between.

So if I have the following request:

GET http://www.example.org/index.html HTTP/1.1

I want the http://www.example.org/index.html in between

RFC7230 Section 5.3.2 allows for this when making a request to a proxy. Section 5.4 says that the Host header should be overriden by the proxy with the host in the URI if the request is in absolute-form. This seems good enough for me, I don't know if WAI would handle this correctly if a client was not behaving correctly and sending a Host header different from the absolute-form URI.

Alternatively, if this is not possible: I'd like to ask if there is a more low level HTTP library than WAI available in Haskell?

Answer 1

The rawPathInfo accessor method will provide this. See https://hackage.haskell.org/package/wai-3.2.2.1/docs/Network-Wai.html#v:rawPathInfo for details.

If you want the query string too, it's available via the rawQueryString accessor.

As for the host, HTTP requests don't normally look like your example (HTTP/1.1 clients will only look like that if they're connecting to a proxy, rather than to the destination Web server). Instead, they often look like this:

GET /index.html HTTP/1.1
Host: www.example.org

If you want http://www.example.org too, then you'll have to rebuild it yourself from the host and protocol information.