Heavy metal SOAP client

Savon v2 

Install Savon via

gem install savon --version '~> 2.0'

or add it to your Gemfile:

gem 'savon', '~> 2.0'

The new client is supposed be a lot simpler to use, because everything in Savon 2.0 is based on a defined set of global and local options. To create a new client based on a WSDL document, you could set the global :wsdl option by passing a Hash to the Savon.client "factory method". The client's constructor accepts various global options which are specific to a service.

client = Savon.client(wsdl: "")

Along with the simple Hash-based interface, Savon also comes with an interface based on blocks. This should look familiar to you if you used Savon 1.x before. If you're passing a block to the constructor, it is executed using the instance_eval with delegation pattern. It's a smart, but ugly, but convenient little hack.

client = Savon.client do
  wsdl ""

The downside to this interface is, that it doesn't allow you to use instance variables inside the block. You can only use local variables or call methods on your class. If you don't mind typing a few more characters, you could accept an argument in your block and Savon will simply yield the global options to it. That way, you can use as many instance variables as you like.

client = Savon.client do |globals|
  globals.wsdl @wsdl

In case your service doesn't have a WSDL, you might need to provide Savon with various other options. For example, Savon needs to know about the SOAP endpoint and target namespace of your service.

client = Savon.client do
  endpoint ""
  namespace ""

A nice little feature that comes with a WSDL, is that Savon can tell you about the available operations.

client.operations  # => [:authenticate, :find_user]

But the client really exists to send SOAP messages, so let's do that.

response =, message: { username: "luke", password: "secret" })

If you used Savon before, this should also look familiar to you. But in contrast to the old client, the new #call method does not provide the same interface as the old #request method. It's all about options, so here's where you have various local options that are specific to a request.

The #call method supports the same interface as the constructor. You can pass a simple Hash or a block to use the instance_eval with delegation pattern.

response = do
  message username: "luke", password: "secret"
  convert_request_keys_to :camelcase

You can also accept an argument in your block and Savon will yield the local options to it.

response = do |locals|
  locals.message username: "luke", password: "secret"
  locals.wsse_auth "luke", "secret", :digest