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Documentation for WebServiceCallout

The WebServiceCallout.invoke method is not documented in any Salesforce publications.  I asked tech support and they don't have any docs either in their internal knowledge base.  They said it is part of the wsdlToApex tool and not documented.  They pointed me to an external forum site where someone has posted some details.  (Sad that I have to go to non-salesforce forum site to get this.)


If anyone else is looking for this info, here is the link:


And here are the details from the post.  I have not verified any of the text or code, use at your own risk.


Object servicePort - A class with the following variables:
  String enpoint_x: containing the service endpoint (not sure if necessary)
  Map<String,String> inputHttpHeaders_x: custom httpHeaders
  Map<String,String> outputHttpHeaders_x: I think this is the httpHeaders that were returned
  String clientCertName_x: Used in configuring an SSL cert?
  String clientCert_x: Used in configuring an SSL cert?
  String clientCertPassword: Used in configuring an SSL cert?
  Integer timeout_x: How long (in milliseconds?) to wait for the response
  String[] ns_map_type_info: The first String is the namespace of the service schema, the second is the name of the object that contains the Apex classes defining the schema objects
Object request_x - The Apex object that will form the XML schema object
Map<String, Object> response_map_x - Object is the object that the result is to be unserialized into. String is the name of Object variable.
String[] {
  endpoint - The service endpoint
  soapAction - If the service call requires a soapAction, put it here. Otherwise leave blank.
  methodSchema - Schema for the request object
  method - Name of the request method
  responseSchema Schema for the response
  responseClass The Apex class that the response will be unserialized into


In addition, Soap headers can be inserted by creating an object in the servicePort class as well as a String with the same variable name+"_hns" that specifies the namespace for that object:

public SoapSecurity Security;
private String Security_hns = "Security=";


The apex XML Schema objects should contain variables for each child element (or attribute). Arrays whose variable names match certain patterns define how the object variables are used in the xml.


Given the following example XML: 

<foo a="b"><bar>baz</bar></foo>


The Apex classes would be something like this:

public class MyService {
   public class bar {
      public String bar;
      private String[] bar_type_info = new String[] {'bar','','string','0','1','true'};
      private String[] apex_schema_type_info = new String[] {'', 'false', 'false'};
      private String[] field_order_type_info = new String[] {'bar'};

   public class foo {
      public bar;
      public String a;
      private String[] bar_type_info = new String[] {'bar','','bar','0','1','true'};
      private String[] a_att_info = new String[] {'a'};
      private String apex_schema_type_info = new String[] {'','false','false'};
      private String[] field_order_type_info = new String[] {'bar'};





Here's a (brief) breakdown of these objects:

If the variable represents another XML element or a text node, then there needs to be a matching _type_info String[] e.g. bar_type_info. The elements of this array are: 1. XML element name 2. Schema 3. XML type 4. minOccurs 5. maxOccurs (set to '-1' for unbounded) 6. isNillable

If the variable represents an attribute, then there must be a matching _att_info String[] e.g. a_type_info. Thise simply contains the XML name of the attribute.

Note that if an class variable name is a reserved word, then _x is appended to it e.g. bar_x. This would affect the other variables names: bar_x_type_info. The Apex Developer's Guide explains their rules for names, but if you are manually creating it, I think you can give it whatever name you want--the arrays determine the XML element name...

I have not found a way to represent a simple XML type that also contains an attribute: e.g.

<foo bar="baz">bar</foo> 

The apex_schema_type_info array specifies information about the XML element represented by the class: 1. Schema 2. 'true' if elementFormDefault="qualified" 3. 'true' if attributeFormDefault="qualified"

I'm still rather fuzzy on what 2 and 3 actually do, but it seems to affect how child elements (and attributes) inherit the parent namespace (whether it's implied or must be specified in the resulting XML).

field_order_type_info simply specifies the order of the child elements.



I at first tried to use wsdl2apex and found it clunky and buggy with no documentation.  In addition, it is almost impossible to debug from what I can tell since you can never see the actual xml being constructed.  I would just go ahead and create your own custom classes.  It just ends up to be a lot quicker in the end, unless you have a massive wsdl that you must take advantage of.


Willard, thanks for your reply.  Unfortunately I am looking at an existing code base that was written late in 2010 and it uses this WebServiceCallout.  I need to add a few methods to the code base and was hoping I could just clone some existing code and modify, but from what you are saying, I might be better off writing a completely new set of methods, sigh.

Chamil MadusankaChamil Madusanka



If a reply to a post answers your question or resolves your problem, please mark it as the solution to the post so that others may benefit.


not documented there.


None there either.