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# SOAP Fault Element

When an error occurs during processing, the response to a SOAP message is a SOAP fault element in the body of the message, and the fault is returned to the sender of the SOAP message. The SOAP fault mechanism returns specific information about the error, including a predefined code, a description, the address of the SOAP processor that generated

- A SOAP Message can carry only one fault block

- Fault element is an optional part of SOAP Message

- For the HTTP binding, a successful response is linked to the 200 to 299 range of status codes;

- SOAP fault is linked to the 500 to 599 range of status codes.

The SOAP Fault element has the following sub elements:

Sub Element | Description
--- | ---
<faultCode> | A text code used to indicate a class of errors. See the next Table for a listing of predefined fault codes.
<faultString> | A text message explaning the error
<faultActor> | A text string indicating who caused the fault. This is useful if the SOAP message travels through several nodes in the SOAP message path, and the client needs to know which node caused the error. A node that does not act as the ultimate destination must include a faultActor element.
<detail> | An element used to carry application-specific error messages. The detail element can contain child elements, called detail entries.

### SOAP Fault Codes

The faultCode values defined below must be used in the faultcode element when describing faults

Error | Description
--- | ---
SOAP-ENV:VersionMismatch | Found an invalid namespace for the SOAP Envelope element
SOAP-ENV:MustUnderstand | An immediate child element of the Header element, with the mustUnderstand attribute set to "1", was not understood
SOAP-ENV:Client | The message was incorrectly formed or contained incorrect information
SOAP-ENV:Server | There was a problem with the server so the message could not proceed

### SOAP Fault Example

The following code is a sample Fault. The client has requested a method named ValidateCreditCard , but the service does not support such a method. This represents a client request error, and the server returns the following SOAP response:

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

    <SOAP-ENV:Envelope
      xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/"
      xmlns:xsi="http://www.w3.org/1999/XMLSchema-instance"
      xmlns:xsd="http://www.w3.org/1999/XMLSchema">
       <SOAP-ENV:Body>
         <SOAP-ENV:Fault>
         <faultcode xsi:type="xsd:string">SOAP-ENV:Client</faultcode>
         <faultstring xsi:type="xsd:string">
              Failed to locate method (ValidateCreditCard) in class
              (examplesCreditCard) at /usr/local/ActivePerl-5.6/lib/
                site_perl/5.6.0/SOAP/Lite.pm line 1555.
            </faultstring>

          </SOAP-ENV:Fault>
      </SOAP-ENV:Body>
    </SOAP-ENV:Envelope>

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