`HttpRequest.getPath()` does not include Function name (expected: `/my-gcp-function/helloworld/`, actual `/helloworld`)

[aSemy]

I've got a GCP Cloud Function, called call-handler. It's got a HTTP trigger. The trigger URL is

https://**location**projectname**.cloudfunctions.net/call-handler

I need to reconstruct the original URL that triggered call-handler. Let's say the original request is

https://**location**projectname**.cloudfunctions.net/call-handler/helloworld

When I log the output of HttpRequest.getPath(), it returns /helloworld, but I need it to be /call-handler/helloworld. This is what the Javadoc says it should be.

The path part of the URI for this request, without any query. If the full URI is
{@code http://foo.com/bar/baz?this=that}, then this method will return {@code /bar/baz}.

The same goes for HttpRequest.getUri(). It returns http://**location**projectname**.cloudfunctions.net/helloworld. (Note that it returns http, which is why I need to reconstruct the original request.)

Issues

The Javadoc isn't accurate, or the code is bugged?

I've posted a work around below, but it would be really useful if this library provided helper functions to accurate generate all the information.

Workaround

A programmatic way of reconstructing the original request URL is to join these strings, in order

1. value of Header X-Forwarded-Proto (docs for headers)
2. ://
3. value of Header Host
4. / (prefix for the cloud function name)
5. environment variable K_SERVICE (docs for env-vars)
6. HttpRequest.getPath():
   1. IFF getPath() has 1 or more elements: prepend with /
   2. join each element with /
   3. Note: no trailing /
7. HttpRequest.getQuery():
   1. IFF getQuery() has 1 or more elements: prepend with ?
   2. join each element with &

In my case, step by step it would be

1. https
2. https://
3. https://**location**projectname**.cloudfunctions.net
4. https://**location**projectname**.cloudfunctions.net/
5. https://**location**projectname**.cloudfunctions.net/call-handler
6. https://**location**projectname**.cloudfunctions.net/call-handler/helloworld
   step by step of path construction:
   1. /
   2. /helloworld
   3. ...
7. https://**location**projectname**.cloudfunctions.net/call-handler/helloworld (no change, no query params)
   1. (getQuery() is empty)
   2. (no elements to join)

It was a lot of work to figure all that out, so I thought I'd share, in case it helps someone else.