--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/http.rst Fri Jul 13 22:32:19 2012 +0300
@@ -0,0 +1,104 @@
+.. -*- coding: utf-8; -*-
+.. include:: HEADER.rst
+
+=======
+ HTTP.
+=======
+
+Command line tools for HTTP protocol.
+=====================================
+
+ http://daniel.haxx.se/docs/curl-vs-wget.html
+ Comparing curl and wget.
+
+Recursive site download.
+========================
+
+``curl`` does not allow recursive site downloading, only ``wget`` can do this::
+
+ $ wget -r -np -nc -e robots=off -p -k http://DOMAIN/PATH
+
+Get server response header.
+===========================
+::
+
+ $ wget --server-response http://example.com
+ $ wget -S http://example.com # short variant
+
+ $ curl --dump-header - http://example.com
+ $ curl -D - http://example.com
+
+View cookies from site.
+=======================
+::
+
+ $ wget --save-cookies FILE -O - http://example.com >/dev/null
+ $ curl --cookie-jar FILE -o - http://example.com >/dev/null
+ $ curl -c FILE -o - http://example.com >/dev/null
+
+Send cookies to site.
+=====================
+::
+
+ $ wget --load-cookies FILE http://example.com
+ $ curl --cookie $name=$data http://example.com
+ $ curl -b $name=$data http://example.com
+
+Send specific header line.
+==========================
+::
+
+ $ wget --header='Accept-Charset: iso-8859-2' --header='Accept-Language: ru' http://example.com
+ $ curl --header 'Accept-Charset: iso-8859-2' http://example.com
+ $ curl -H 'Accept-Charset: iso-8859-2' http://example.com
+
+Send POST request.
+==================
+
+Log in to the server. This can be done only once::
+
+ $ wget --save-cookies cookies.txt --post-data 'user=foo&password=bar' http://server.com/auth.php
+
+Now grab the page or pages we care about::
+
+ $ wget --load-cookies cookies.txt -p http://server.com/interesting/article.php
+
+Web server in Cygwin.
+=====================
+::
+
+ $ setup -p apache2,lighttpd,dhttp
+
+Compressing HTTP data.
+======================
+
+Starting with HTTP/1.1, web clients can indicate support for compression::
+
+ Accept-Encoding: gzip, deflate
+
+Web server notifies the web client of this via the Content-Encoding header in
+the response::
+
+ Content-Encoding: gzip
+
+ETags.
+======
+
+Server respond::
+
+ HTTP/1.1 200 OK
+ Last-Modified: Tue, 12 Dec 2006 03:03:59 GMT
+ ETag: "10c24bc-4ab-457e1c1f"
+ Content-Length: 12195
+
+Lately client send::
+
+ GET /i/yahoo.gif HTTP/1.1
+ Host: us.yimg.com
+ If-Modified-Since: Tue, 12 Dec 2006 03:03:59 GMT
+ If-None-Match: "10c24bc-4ab-457e1c1f"
+
+and get respond::
+
+ HTTP/1.1 304 Not Modified
+