Exploring the SOAP Prototype's Use of the Ajax SOAPAction Header

While attempting to send a request and include a SOAP object, I encountered an issue where the responseXML was not being returned even though the request was successful. After testing with Fiddler and HTTP Client, both of which returned the correct responses, it became clear that the problem lied within Prototype.

I tested putting the information in both the header and parameters fields...

<script type="text/javascript" src="prototype.js"></script>
<script type="text/javascript">
    function test(){
        var body = '<?xml version="1.0" encoding="utf-8"?>' +
        '<soap:Envelope' +
        ' xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"' +
        ' xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/"' +
        ' xmlns:tns="urn:uvindexalert" xmlns:types="urn:uvindexalert/encodedTypes"' +
        ' xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"' +
        ' xmlns:xsd="http://www.w3.org/2001/XMLSchema">' +
        '  <soap:Body soap:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">' +
        '    <tns:getUVIndexAlertByZipCode>' +
        '       <in0 xsi:type="xsd:string">92109</in0>' +
        '   </tns:getUVIndexAlertByZipCode>' +
        '  </soap:Body>' +
        '</soap:Envelope>';

        var headers = ["SOAPAction", " ", "Content-Type", "text/xml"];

        var request = new Ajax.Request("http://iaspub.epa.gov/uvindexalert/services/UVIndexAlertPort?wsdl", {
            contentType: "application/xml",
            requestHeaders: headers,
            parameters: "SOAPAction: ",
            postBody: body,
            onSuccess: function(response){
                var j = 0;
            },
            onFailure: function(){
                var i = 0;
            }
        });
    }

    test();
</script>

The variables i & j are included for debugging purposes. I also researched online and found a suggestion to switch from `text/xml` to `application/xml` along with adding `charset=utf-8`, however, this did not solve the issue. Does anyone have a definite solution for retrieving XML with a SOAPAction?

Answer №1

Aside from concerns about cross site scripting security, my experience with a Prototype.js SOAP client involved troubleshooting issues with the 'Content-Type' and 'SOAPAction' headers. I eventually found success by using the following configuration (although restricted to requests within the same domain).

Content-Type: text/xml; charset=utf-8
SOAPAction: ""

To address OPTIONS requests, the webserver must include the following header:

Access-Control-Allow-Origin: *

Answer №2

Ajax doesn't allow for cross-domain requests due to security measures in place.

Although there are ongoing initiatives to facilitate secure cross-domain requests, they lack universal browser support and necessitate collaboration from the target site. An alternative approach is the utilization of an HTTP proxy script, which acts as an intermediary on your server to handle Ajax requests, interact with remote URLs, and relay responses.

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