Fragmented Requests

Some clients do not transmit the entire request in one go, which results in the server responding to a partial request.
Instead of
```
Client Server
Header+Body -----------> Analyse
<----------- Respond
```
we get
```
Header -----------> Analyse
<----------- Error
Body -----------> Analyse
<---------- Error
```
a) Two responses are made to a single message
b) The message is analysed incorrectly.

I haven't seen a fragmented header, or a fragmented body, but I have no reason to believe that is impossible. The server needs to accept a request in dribs and drabs and (perhaps) time-out a partially received message after a suitable period.