Include xml prolog in web request

Question

I've added a Service Reference for a third-party web service to my project. When i send a request to a webservice using the generated method, the request fails saying that it is missing the XML prolog.

How can I add:

<?xml version="1.0" encoding="UTF-8"?>

to the begining of the request before sending it?

This is a C# web application.

Answer 1

Can you share the service reference.

Use fiddler to see if that is the actual case (sniff the wire to see what is being sent)

Answer 2

According the the documentation, this is a valid request:

<?xml version="1.0" encoding="UTF-8" ?>
<SOAP-ENV:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:fre="http://www.dwdev.com/Webservices/Freezerworks/" xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/"&gt;
   <SOAP-ENV:Header/>
   <SOAP-ENV:Body>
      <fre:StudySamplesSearch SOAP-ENV:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"&gt;
         <UserName xsi:type="xsd:string">myname</UserName>
         <Password xsi:type="xsd:string">mypassword</Password>
         <SearchServiceName xsi:type="xsd:string">StudySamplesSearch</SearchServiceName>
         <FieldNames xsi:type="fre:ArrayOfstring" SOAP-ENC:arrayType="xsd:string[1]">
      <string xsi:type="xsd:string">Studyname</string>
      </FieldNames>
         <Comparators xsi:type="fre:ArrayOfstring" SOAP-ENC:arrayType="xsd:string[1]">
      <string xsi:type="xsd:string">is equal to</string>
      </Comparators>
         <SearchValues xsi:type="fre:ArrayOfstring" SOAP-ENC:arrayType="xsd:string[1]">
      <string xsi:type="xsd:string">FS-101</string>
      </SearchValues>
         <Conjunctions xsi:type="fre:ArrayOfstring" SOAP-ENC:arrayType="xsd:string[]"/>
      </fre:StudySamplesSearch>
   </SOAP-ENV:Body>
</SOAP-ENV:Envelope>

However, this is the actual request being sent:

<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/"&gt;
    <s:Body s:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"&gt;
     <q1:StudySamplesSearch xmlns:q1="http://www.dwdev.com/Webservices/Freezerworks/"&gt;
      <UserName xsi:type="xsd:string">myname</UserName>
      <Password xsi:type="xsd:string">mypassword</Password>
      <SearchServiceName xsi:type="xsd:string">StudySamplesSearch</SearchServiceName>
      <FieldNames href="#id1"/>
      <Comparators href="#id2"/>
      <SearchValues href="#id3"/>
      <Conjunctions href="#id4"/>
     </q1:StudySamplesSearch>
     <q2:Array id="id1" q2:arrayType="xsd:string[1]" xmlns:q2="http://schemas.xmlsoap.org/soap/encoding/"&gt;
      <Item>Studyname</Item>
     </q2:Array>
     <q3:Array id="id2" q3:arrayType="xsd:string[1]" xmlns:q3="http://schemas.xmlsoap.org/soap/encoding/"&gt;
      <Item>is equal to</Item>
     </q3:Array>
     <q4:Array id="id3" q4:arrayType="xsd:string[1]" xmlns:q4="http://schemas.xmlsoap.org/soap/encoding/"&gt;
      <Item>FS-101</Item>
     </q4:Array>
     <q5:Array id="id4" q5:arrayType="xsd:string[0]" xmlns:q5="http://schemas.xmlsoap.org/soap/encoding/"/&gt;
    </s:Body>
</s:Envelope>

So even when I manually add the prolog and manually send the request using SoapUI, i get additional errors. The next being: Malformed SOAP request, SOAP-ENV:Envelope element not found at root.

So it seems that I have more problems than just a missing prolog.

Answer 3

Ok, so i'm down to one problem. My request now looks like this:

<?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="http://www.dwdev.com/Webservices/Freezerworks/" 
 xmlns:types="http://www.dwdev.com/Webservices/Freezerworks/encodedTypes" 
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
 xmlns:xsd="http://www.w3.org/2001/XMLSchema"&gt;
 <soap:Body soap:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"&gt;
  <tns:StudySamplesSearch>
   <UserName xsi:type="xsd:string">svc.soap</UserName>
   <Password xsi:type="xsd:string">p5Ns9EF</Password>
   <SearchServiceName xsi:type="xsd:string">StudySamplesSearch</SearchServiceName>
   <FieldNames href="#id1" />
   <Comparators href="#id2" />
   <SearchValues href="#id3" />
   <Conjunctions href="#id4" />
  </tns:StudySamplesSearch>
  <soapenc:Array id="id1" soapenc:arrayType="xsd:string[1]">
   <Item>Studyname</Item>
  </soapenc:Array>
  <soapenc:Array id="id2" soapenc:arrayType="xsd:string[1]">
   <Item>is equal to</Item>
  </soapenc:Array>
  <soapenc:Array id="id3" soapenc:arrayType="xsd:string[1]">
   <Item>FS-101</Item>
  </soapenc:Array>
  <soapenc:Array id="id4" soapenc:arrayType="xsd:string[0]" />
 </soap:Body>
</soap:Envelope>

However, the web service is erroring out saying SOAP-ENV:Envelope element not found at root

If I manually change the prefix from soap to SOAP-ENV the request is successful. Is there a way to specify the prefix when creating the web reference?

Answer 4

The 3rd-party has fixed the webservice. Problem solved.