title: `env:Client` SOAP Fault with fault string `Internal Error (from client)` on Savon 2.0 SOAP request with correct params
body: <p>Using Savon 2.0 to make a SOAP request, I'm getting an <code>env:Client</code> fault code with the fault string <code>Internal Error (from client)</code>:</p>
  
  <pre class="lang-xml prettyprint-override"><code>D, [2020-06-09T05:37:51.323537 #8] DEBUG -- : HTTPI TLSv1_2/none POST request to REDACTED (httpclient)
  I, [2020-06-09T05:37:51.370053 #8]  INFO -- : SOAP response (status 500)
  D, [2020-06-09T05:37:51.370636 #8] DEBUG -- : &lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;env:Envelope xmlns:env="http://schemas.xmlsoap.org/soap/envelope/"&gt;
    &lt;env:Body&gt;
      &lt;env:Fault&gt;
        &lt;faultcode&gt;env:Client&lt;/faultcode&gt;
        &lt;faultstring&gt;Internal Error (from client)&lt;/faultstring&gt;
      &lt;/env:Fault&gt;
    &lt;/env:Body&gt;
  &lt;/env:Envelope&gt;
  </code></pre>
  
  <p>The request itself is well-formed and contains all the necessary request parameters.</p>