Http-Url-Arg

(http-url-arg http-url key) -> string or #f

Returns the value associated with the given key in the "args" field of the given <http-url>.

Example:

>> (define a (string->url

"http://en.wikipedia.org/wiki/Special:Search?search=Lisp&fulltext=fulltext&sourceid=mozilla-search"))

:: #f
>> (http-url-args a)
:: [dict ("fulltext" . "fulltext") ("search" . "Lisp") ("sourceid" . "mozilla-search")]
>> (http-url-arg a "search")
:: "Lisp"