How to identify SOAP version in a message?

In this blog post, let us see about how to identify Simple Object Access Protocol (SOAP) version in a message. Sometimes, you will be skeptical about the version of your SOAP version in a message. There are two versions of SOAP being widely used: SOAP 1.1 and SOAP 1.2.

Identify SOAP Version

Method 1: Using Namespaces

By checking the namespaces in the message helps you to identify the SOAP version. Below are the specifications.

SOAP 1.1:

SOAP 1.2:

Below is the sample xml message which has the envelope which is SOAP 1.1 version.

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

<soapenv:Envelope xmlns:soapenv="" xmlns:xsd="" xmlns:xsi=""> 


    <listUsers xmlns="" />



Method 2: SOAP Action Header

Typically SOAP 1.1 will have the content type as text/xml. Below is the sample header information.

POST /YourService HTTP/1.1

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

Content-Length: xxx

SOAPAction: "urn:uuid:youraction"

But SOAP 1.2 will have the content type as application/soap+xml. Below is the sample header information.

Method 3: Fault Information

  • Names of the fault elements will look different.
  • SOAP 1.1 fault elements are not namespace qualified, but all the SOAP 1.2 elements are namespace qualified.
  • SOAP 1.1 uses the lower case letters in the fault elements.
  • SOAP 1.2 Code elements can have the sub codes within it that describe the SOAP fault hierarchy.

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