jbe@262: --[[--
jbe@262: request.configure(
jbe@262:   func              -- function which is performing the configuration
jbe@262: )
jbe@262: 
jbe@262: Registers a function to be called on every request only if a request is not in progress yet. Executes the function once in any case.
jbe@262: 
jbe@262: --]]--
jbe@262: 
jbe@262: function request.configure(func)
jbe@262:   if not request._in_progress then
jbe@262:     local initializers = request._initializers
jbe@262:     initializers[#initializers+1] = func
jbe@262:   end
jbe@262:   func()
jbe@262: end