Azure Server error when port appended to host header

Question

I'm running an Azure Web App that's meant to accept XML Posts. When I post to the urls using cURL everything works, however, when using Apache Camel/HTTP the POST results in a 400 error. When I look at the log files, the only difference is cs-host field. For the cURL commands the value is just the domain (e.g. azurewebsites.net), however the Apache POST appends port 80 (e.g. azurewebsites.net:80). I added a rewrite rule that would strip the port from the call (rule details below), but the POST still results in 400 error. The closest related post I could find was here: Including Port number in HTTP HOST header causes Service Unavailable error but unfortunately it looks like it's related to Netscaler, not Azure Web App, and the resolution didn't provide any detailed guidance.. Thanks for any input!

Here's the rewrite rule:

<?xml version="1.0" encoding="utf-8"?>
<configuration xmlns:xdt="http://schemas.microsoft.com/XML-Document-Transform">
  <location path="domain" xdt:Locator="Match(path)">
    <system.webServer>
      <rewrite xdt:Transform="InsertBefore(/configuration/location[(@path='domain')]/system.webServer/*[1])">
        <rules>
          <rule name="domainrule1" stopProcessing="true">
            <match url="domain.azurewebsites.net:80(.*)" />
            <action type="Redirect" url="http://domain.azurewebsites.net/{R:1}" />
          </rule>
        </rules>
      </rewrite>
    </system.webServer>
  </location>
  <location path="~1domain" xdt:Locator="Match(path)">
    <system.webServer>
      <rewrite>
        <rules>
          <rule name="domainrule2" stopProcessing="true" xdt:Transform="Insert">
            <match url="domain.azurewebsites.net:80(.*)" />
            <action type="Redirect" url="http://domain.azurewebsites.net/{R:1}" />
          </rule>
        </rules>
      </rewrite>
    </system.webServer>
  </location>
</configuration>