AJAX Cross Domain is a free library that allows to perform AJAX requests between different domains.
Synopsis
<script type="text/javascript" src="http://www.ajax-cross-domain.com/cgi-bin/ACD/ACD.js?uri=(http://www.google.com)"></script> <script type="text/javascript"> alert(ACD.responseText); </script>
Motivation
Virtually all modern server-side
scripting languages support remote requests in one or another form. In client-side
javascript, this functionality is not present due to the
Same Origin Policy. Though this policy is necessary for a robust security model, programmers are often handicapped in their wish to send and retrieve requests to remote servers. During the last years, several proposals have been made for a more flexible (re-)design of the
XMLHttpRequest object, which is the core mechanism of all
AJAX based technologies. AJAX Cross Domain provides in the full functionality of the
XMLHttpRequest object in a similar syntax, and can by extent handle all cross-domain requests. The core engine of AJAX Cross Domain is written in
Perl and outputs its content as a
javascript file.
Examples
This example alerts the response body of an URL with a query-string:
<script type="text/javascript" src="http://www.ajax-cross-domain.com/cgi-bin/ACD/ACD.js?uri=(http://216.92.131.147/dotserv/ACD/?name=john)"></script> <script type="text/javascript"> alert(ACD.responseText); </script>
This example does a remote request and shows all the response headers:
<script type="text/javascript" src="http://www.ajax-cross-domain.com/cgi-bin/ACD/ACD.js?uri=(http://www.google.com/)"></script> <script type="text/javascript"> alert(ACD.getAllResponseHeaders); </script>
This example returns only a specific header of interest:
<script type="text/javascript" src="http://www.ajax-cross-domain.com/cgi-bin/ACD/ACD.js?uri=(http://www.google.com/)"></script> <script type="text/javascript"> if (ACD.getResponseHeader['Content-Type']) { alert(ACD.getResponseHeader['Content-Type']); } </script>
This example returns the HTTP status code of the response:
<script type="text/javascript" src="http://www.ajax-cross-domain.com/cgi-bin/ACD/ACD.js?uri=(http://www.microsoft.com/)"></script> <script type="text/javascript"> alert(ACD.status); </script>
This example performs a POST request to the given URI and shows the request how it was offered to the remote resource:
<script type="text/javascript" src="http://www.ajax-cross-domain.com/cgi-bin/ACD/ACD.js?uri=(http://216.92.131.147/dotserv/ACD/runit/post.cgi)&method=post&postdata=(name=fred&email=fred@fred.com)"></script> <script type="text/javascript"> alert(ACD.responseText); </script>
If
postdata is present, it is assumed that the request method is meant as post even when
method=post is not explicitly mentioned. The following example performs a (somewhat more complex percent-encoded) POST-request and returns the response body:
<script type="text/javascript" src="http://www.ajax-cross-domain.com/cgi-bin/ACD/ACD.js?uri=(http://216.92.131.147/dotserv/ACD/runit/post.cgi)&postdata=(name=John%20Johnson&email=john@gmail.com&company=C%26A%20%28until%20May%29&sum=1%2B1%3D2)"></script> <script type="text/javascript"> alert(ACD.responseText); </script>
This example sends a request with header
User-Agent set to
My cool User-Agent and header
Content-Language set to
en, and shows the request that was offered to the remote server:
<script type="text/javascript" src="http://www.ajax-cross-domain.com/cgi-bin/ACD/ACD.js?uri=(http://www.google.com)&headers=(User-Agent=My%20cool%20User-Agent&Content-Language=en)"></script> <script type="text/javascript"> alert(ACD.request); </script>
This example generates an error because
uri is invalid:
<script type="text/javascript" src="http://www.ajax-cross-domain.com/cgi-bin/ACD/ACD.js?uri=(http/www.google.com)"></script> <script type="text/javascript"> alert(ACD.error); </script>
AJAX Cross Domain - ACD
