\chapter{Parsing and Processing URLs}\label{cha:url}
%
The \ex{url} module contains procedures to parse and unparse HTTP 1.1 Request-URIs.

\defun{url-string->http-url}{string}{http-url}
\begin{desc}
 \ex{Url-string->http-url} parses the Request-URI \var{string} into a
 \ex{http-url} record.
\end{desc}

\defun{http-url?}{thing}{boolean}
\begin{desc}
  \ex{http-url?} is the predicate for the \ex{http-url} record.
\end{desc}

\defun{http-url-host}{http-url}{string or \sharpf}
\defunx{http-url-port}{http-url}{integer or \sharpf}
\defunx{http-url-path}{http-url}{list}
\defunx{http-url-query}{http-url}{string or \sharpf}

\begin{desc}
  \ex{http-url-host}, \ex{http-url-port}, \ex{http-url-path} and
  \ex{http-url-query} are the selectors for the \ex{http-url} record.

  The \var{host} slot is a non-empty string or \sharpf. 

  The \var{port} slot is an integer or \sharpf.
 
  The \var{path} slot is a list containing the Request-URI's  path
  split at slashes and \emph{unescaped}.

  The \var{query} slot is an non-empty-string, still in its
  \emph{escaped} representation, or \sharpf.
\end{desc}
%
Examples for Request-URI strings and the slots of the corresponding http-url record:
\begin{alltt}
"http://foo.bar.org:7777///foo%20foo//bar.htm?bulb%20bulb"
\(\Rightarrow\) "foo.bar.org" 7777 '("foo foo" "bar.htm") "bulb%20bulb"

"http://foo.bar.org/"
\(\Rightarrow\) "foo.bar.org" #f '() #f

"/foo%20foo//bar.htm?bulb%20bulb"
\(\Rightarrow\)  #f #f '("foo foo" "bar.htm") "bulb%20bulb"

"/" 
\(\Rightarrow\) #f #f '() #f
\end{alltt}


\defun{http-url->url-string}{http-url}{string}
\begin{desc}
  \ex{http-url->url-string} unparses a http-url record into its
  corresponding Request-URI.
\end{desc}

\defun{http-url-path->path-string}{http-url-path}{string}
\begin{desc}
  \ex{http-url-path->url-string} unparses the http-url-path field of
  an http-url record into its corresponding part of the Request-URI,
  re-escaping the path.
\end{desc}
Example:
\begin{alltt} 
'("foo foo" "bar.htm") \(\Rightarrow\) "/foo%20foo/bar.htm"
\end{alltt}

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