[e2e] Limit on simultaneous Persistent connections to a HTTP server

Joe Touch touch at ISI.EDU
Fri Mar 9 08:10:17 PST 2007

Abi Babu wrote:
> Is there a limit on the number of persistent (HTTP/1.0)connections
> that an HTTP client simultaneously opens with a web server?
> The HTTP/1.1 RFC constrains a client to at most
> two simultaneous persistent connections

RFC2616, Sec 8.1.4, says:

   Clients that use persistent connections SHOULD limit the number of
   simultaneous connections that they maintain to a given server. A
   single-user client SHOULD NOT maintain more than 2 connections with
   any server or proxy.

SHOULD isn't a constraint; it's a strong recommendation not to do
otherwise unless there is a particular overriding consideration.

It's not the same as "MUST", so no, there is no strict limit for 1.1.

1.0 didn't specify persistent connections AFAICT; that was a later
addition as I recall.


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