On 20-Nov-08, at 2:59 AM, Nathan Rixham wrote:
Rene Fournier wrote:
On 19-Nov-08, at 12:52 PM, Nathan Rixham wrote:
Rene Fournier wrote:
Hi,
I have four identical command-line PHP scripts running, and each
will frequently fetch some data from another server via
file_get_contents(). By frequently, I mean on average, every
second.
Periodically, one of the processes (command-line PHP scripts),
will fail on file_get_contents(), with the error message:
first thing that springs to mind is some form of hardware
limitation, quite sure it's not php - could be a firewall with
flood protection (or even your own isp's anti malware set-up)
to combat it try binding the outgoing request to a random ip each
time (if you have multiple ip's on the box) [context: socket ->
bindto]
That could explain it, except that all the traffic is on the same
LAN. There's no firewall between Server A and Servers B and C.
next up (very unlikely) but possibly outgoing port conflict where
the previous local port is still closing whilst trying to be re-
opened.
That's interesting. I will look into that.
to get an ideal fix though you'll want to move away from
file_get_contents() as you're not doing things
Yes, I've also read that CURL is preferred to file_get_contents for
reasons of performance and security. I'm going to try that too.
the most efficient way; HTTP/1.1 allows you to keep a port open
and make multiple requests through the same socket/connection,
simply keep the socket open and don't send a connection: close
header after the request. (i say simply but you'll be needing to
make you're own, or find a good, http handler that allows you to
write raw requests and decode the raw http responses that come back)
best of luck; feel free to post your code incase anything jumps
out as obvious.
I will let you know how it goes. Thanks for the advice!
...Rene
had another thought, it could be the web server you're requesting
that is locking up, not enough worker threads, running cpu high etc
etc - worth checking
Don't think that can be it, since (a) the other processes are not
being denied their http requests and (b) requests are going to two
servers.
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