ColdFusion (CFML) Localhost CFHTTP Call Inside of Docker on MacOSX

cfml-cfhttp-docker.md

There's an issue when attempting to perform a cfhttp call inside of Docker to localhost on MacOSX. For some reason, this issue does not appear to exist on Windows. Instead of hitting localhost, you must use the "Service Name" as defined in your docker-compose.yml file, and the container's exposed port (NOT the one you're using outside of the container).

Example docker-compose.yml

version: '3.3'
  services:
    myservice:
      build:
        context: .
      image: some-image
      depends_on:
        - svc_someservice
      environment:
        # blah
      volumes:
        - ./www:/app
      ports:
        - '80:8080'
      # etc.

In the example above, our service is named myservice, and the exposed port is 8080. So, to make a cfhttp call, you would have to format your URL as http://myservice:8080/some/path/. This would result in the following examples:

CFScript (CF9+)

svcHttp = new http(method='GET', charset='utf-8', url='http://myservice:8080/some/path/');
svcHttp.addParam(name='q', type='formfield', value='somevalue');
result = svcHttp.send().getPrefix();
WriteDump(result);

CFScript (CF11+)

cfhttp(method='GET', charset='utf-8', url='http://myservice:8080/some/path/', result='result') {
  cfhttpparam(name='q', type='formfield', value='somevalue');
}
WriteDump(result);

CFHTTP Tag Syntax

<cfhttp method="GET" charset="utf-8" url="http://myservice:8080/some/path/" result="result">
  <cfhttpparam name="q" type="formfield" value="somevalue" />
</cfhttp>
<cfdump var="#result#" />