Anyone supplying an answer would be guessing...you haven't really provided much detail.

• Are the clients that submitted the request waiting, on the same socket, for a reply? Or is it fire-and-forget?
• Is the FIFO requirement literal, as in, request #2 blocks until request #1 is fully completed...even if it could be run in parallel? Even if the two requests came from different connected clients?
• How large are the requests (bytes), and response (if there is one)?
• As mentioned in another reply, are the clients on a local LAN or remote? Is cleartext okay? Do the clients need to authenticate?
• Are the clients cell phones? web browsers? Something else?

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