Can ec.js be proxied with server side gtm?

Question

Was wondering if only gtm.js and analytics.js can be proxied via gtm server? Can't find any information about this on google docs. Also, getting an error 404 when trying to fetch it with server side gtm.

Answer 1

There is a bug where plugins/ua/ec.js will be fetched via https://your.domain/plugins/ua/ec.js

When that happens you have to pick that client request up and return the script manually (by writing a client template in on the server side container).

found a repo with the code example which shortened the hours I would had used otherwise. credit: https://gist.github.com/mbaersch/e94e2499ea5bb761bf81878d815fd890#file-fix-ecjs-client-tpl Here comes the important part:

const setResponseBody = require('setResponseBody');
const setResponseHeader = require('setResponseHeader');
const setResponseStatus = require('setResponseStatus');
const sendHttpGet = require('sendHttpGet');
const templateDataStorage = require('templateDataStorage');
const returnResponse = require('returnResponse');
const key = "ec.js";

if (require('getRequestPath')() === '/plugins/ua/ec.js') {
  require('claimRequest')();
  setResponseHeader('content-type', 'application/javascript');
  const cachedBody = templateDataStorage.getItemCopy(key);
  if (cachedBody) {
    setResponseBody(cachedBody);
    setResponseStatus(200);
    returnResponse();
  } else {
    sendHttpGet('https://www.google-analytics.com/plugins/ua/ec.js', (statusCode, headers, body) => {
      templateDataStorage.setItemCopy(key, body);
      setResponseBody(body);
      setResponseStatus(statusCode);
      returnResponse();
    });    
  }  
}