vibe.d: Finding out if currently in webinterface request

[Johannes Loher]

I already posted this in the vibe.d forums 
(https://forum.rejectedsoftware.com/groups/rejectedsoftware.vibed/thread/58891/), but it seems, there is not a lot of activity over there, so I am cross posting this here:

Is there a way to find out, if we are currently in a webinterface 
request?

My usecase is the following:

I want to implement a logger, which in addition to the actual log 
message also logs information about the request which is 
currently being handled (if any). For this I would like to call 
request(), which gives me the current HTTPServerRequest. However, 
this results in an AssertError, whenever logging appears outside 
of a webinterface request (so basically immediately after 
starting the application, because vibe.d logs some things 
automatically). So I would need to check, if we are currently 
processing a webinterface request.

Another usecase which would be interesting to me and which has 
the exact same problem is the following:

Suppose in my received request, there is an HTTP header 
X-Correlation-Id: <uuid>. Now whenever during processing of this 
request I start an HTTP request to some other service (e.g. via 
requestHTTP()), I also want to include this header in the new 
request I send. Of course, you could implement this by always 
passing the header manually, but I'd prefer to implement this 
using a generalized wrapper around requestHTTP(). But then in 
this wrapper, I would also need to call request(), which makes it 
impossible to call it from outside of webinterface request (e.g. 
it could be triggered by a timer, or something like this). But it 
would be nice, to be able to just use a single function for all 
my requests (to keep things uniform).