LWP::Debug(3pm) User Contributed Perl Documentation LWP::Debug(3pm)
LWP::Debug - debug routines for the libwww-perl library
use LWP::Debug qw(+ -conns);
# Used internally in the library
LWP::Debug::conns("read $n bytes: $data");
LWP::Debug provides tracing facilities. The trace(), debug() and
conns() function are called within the library and they log information
at increasing levels of detail. Which level of detail is actually
printed is controlled with the "level()" function.
The following functions are available:
The "level()" function controls the level of detail being logged.
Passing '+' or '-' indicates full and no logging respectively.
Individual levels can switched on and of by passing the name of the
level with a '+' or '-' prepended. The levels are:
trace : trace function calls
debug : print debug messages
conns : show all data transfered over the connections
The LWP::Debug module provide a special import() method that allows
you to pass the level() arguments with initial use statement. If a
use argument start with '+' or '-' then it is passed to the level
function, else the name is exported as usual. The following two
statements are thus equivalent (if you ignore that the second
pollutes your namespace):
use LWP::Debug qw(+);
use LWP::Debug qw(level); level('+');
The "trace()" function is used for tracing function calls. The
package and calling subroutine name is printed along with the
passed argument. This should be called at the start of every major
The "debug()" function is used for high-granularity reporting of
state in functions.
The "conns()" function is used to show data being transferred over
the connections. This may generate considerable output.
perl v5.10.0 2008-04-07 LWP::Debug(3pm)