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add (web client) docs

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* doc/ref/web.texi (Web Client): New doc section.
This commit is contained in:
Andy Wingo 2011-10-12 11:24:58 +02:00
parent 30fcf30fcf
commit ec81143964
1 changed files with 37 additions and 2 deletions
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doc/ref/web.texi
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@ -39,6 +39,7 @@ back.
* HTTP Headers:: How Guile represents specific header values.
* Requests:: HTTP requests.
* Responses:: HTTP responses.
* Web Client:: Accessing web resources over HTTP.
* Web Server:: Serving HTTP to the internet.
* Web Examples:: How to use this thing.
@end menu
@ -303,8 +304,8 @@ types by providing a number of low-level parsers and unparsers for
elements of the HTTP protocol.
If you are want to skip the low-level details for now and move on to web
pages, @pxref{Web Server}. Otherwise, load the HTTP module, and read
on.
pages, @pxref{Web Client}, and @pxref{Web Server}. Otherwise, load the
HTTP module, and read on.
@example
(use-modules (web http))
@ -1281,6 +1282,40 @@ Return the given response header, or @var{default} if none was present.
@end deffn
@node Web Client
@subsection Web Client
@code{(web client)} provides a simple, synchronous HTTP client, built on
the lower-level HTTP, request, and response modules.
@deffn {Scheme Procedure} open-socket-for-uri uri
@end deffn
@deffn {Scheme Procedure} http-get uri [#:port=(open-socket-for-uri uri)] [#:version='(1 . 1)] [#:keep-alive?=#f] [#:extra-headers='()] [#:decode-body=#t]
Connect to the server corresponding to @var{uri} and ask for the
resource, using the @code{GET} method. If you already have a port open,
pass it as @var{port}. The port will be closed at the end of the
request unless @var{keep-alive?} is true. Any extra headers in the
alist @var{extra-headers} will be added to the request.
If @var{decode-body?} is true, as is the default, the body of the
response will be decoded to string, if it is a textual content-type.
Otherwise it will be returned as a bytevector.
@end deffn
@code{http-get} is useful for making one-off requests to web sites. If
you are writing a web spider or some other client that needs to handle a
number of requests in parallel, it's better to build an event-driven URL
fetcher, similar in structure to the web server (@pxref{Web Server}).
Another option, good but not as performant, would be to use threads,
possibly via par-map or futures.
More helper procedures for the other common HTTP verbs would be a good
addition to this module. Send your code to
@email{guile-user@@gnu.org}.
@node Web Server
@subsection Web Server