Instead of relying on a `apiVersion` config variable that has to be
changed and semver respected we use a deployment id that is new on each
deployment to do cache busting
In case of a `ResponseParseError` instead of comparing the versions of
httpd and the web client strictly, we should make sure to check if httpd
fulfills the web clients version requirement (to be the same major
version) and else fallback to a more verbose error about the different
versions.
Sebastian Martinez