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This queue is for tickets about the libwww-perl CPAN distribution.

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The Basics
Id: 78829
Status: resolved
Priority: 0/
Queue: libwww-perl

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Owner: Nobody in particular
Requestors: SREZIC [...] cpan.org
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Bug Information
Severity: Wishlist
Broken in: 6.04
Fixed in: (no value)



Subject: Use keep_alive in lwp-request
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Using keep-alive in lwp-request is useful if the requested URL is redirected. Here's a call to such an URL with strace logging of connect() system calls: $ strace -econnect /opt/perl-5.14.2/bin/lwp-request -eS http://www.microsoft.com connect(3, {sa_family=AF_FILE, path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory) connect(3, {sa_family=AF_FILE, path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory) connect(3, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("10.0.11.1")}, 16) = 0 connect(3, {sa_family=AF_INET, sin_port=htons(80), sin_addr=inet_addr("65.55.57.27")}, 16) = -1 EINPROGRESS (Operation now in progress) connect(3, {sa_family=AF_INET, sin_port=htons(80), sin_addr=inet_addr("65.55.57.27")}, 16) = 0 connect(3, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("10.0.11.1")}, 16) = 0 connect(3, {sa_family=AF_INET, sin_port=htons(80), sin_addr=inet_addr("65.55.57.27")}, 16) = -1 EINPROGRESS (Operation now in progress) connect(3, {sa_family=AF_INET, sin_port=htons(80), sin_addr=inet_addr("65.55.57.27")}, 16) = 0 GET http://www.microsoft.com 302 Found ... If keep_alive is used, then the number of connect() syscalls is reduced: $ strace -econnect perl5.14.2 ~/trash/lwp-request -eS http://www.microsoft.com connect(3, {sa_family=AF_FILE, path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory) connect(3, {sa_family=AF_FILE, path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory) connect(3, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("10.0.11.1")}, 16) = 0 connect(3, {sa_family=AF_INET, sin_port=htons(80), sin_addr=inet_addr("65.55.57.27")}, 16) = -1 EINPROGRESS (Operation now in progress) connect(3, {sa_family=AF_INET, sin_port=htons(80), sin_addr=inet_addr("65.55.57.27")}, 16) = 0 GET http://www.microsoft.com 302 Found ... Here's a diff which implements unconditional use of keep-alive: https://github.com/eserte/libwww-perl/commit/ec45894ff69014218ce6decca49ddf734fdb3fae Regards, Slaven


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