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7 (www server-utils parse-request)

The (www server-utils parse-request) module provides procedures to read the first line, the headers and the body, of an HTTP message on the input port.

Procedure: receive-request port [keyword value…]
Keywords: s2s, style 

Return a request object read from port. Use s2s (defaults to string-titlecase) to normalize the header names. With #:s2s string-downcase, for instance, you would see (host . "example.com") in the headers field of the request object.

Keyword arg style is an object specifying the syntax of the initial (non-body) portion. By default, parse expects a normal HTTP 1.1 request message as per RFC 2616.

Type: request

A request object has five fields.

method

A symbol, such as GET.

upath

A string. You can use hqf<-upath and alist<-query to break this down further.

protocol-version

A pair of integers indicating the protocol version. For example, (1 . 1) corresponds to HTTP 1.1.

headers

A list of pairs (name . value), aka alist, where name is a symbol and value is a string. How name is normalized depends on which s2s was specified to receive-request.

body

Either #f or a procedure get-body. This should be called with one arg, flags, to retrieve the request body. See http, procedure receive-response, for flags documentation.

Procedure: request? obj

Return #t if obj is a request object.

Procedure: request-method req
Procedure: request-upath req
Procedure: request-protocol-version req
Procedure: request-headers req
Procedure: request-body req

Return the respective field of request object req.

Procedure: hqf<-upath upath

Parse string upath and return three values representing its hierarchy, query and fragment components. If a component is missing, its value is #f.

(hqf<-upath "/aa/bb/cc?def=xyz&hmm#frag")
⇒ "/aa/bb/cc"
⇒ "def=xyz&hmm"
⇒ "frag"

(hqf<-upath "/aa/bb/cc#fr?ag")
⇒ "/aa/bb/cc"
⇒ #f
⇒ "fr?ag"
Procedure: alist<-query query-string

Parse urlencoded query-string and return an alist. For each element (name . value) of the alist, name is a string and value is either #f or a string.


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