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Plack::Middleware::AccessLog − Logs requests like Apache’s log format


  # in app.psgi
  use Plack::Builder;
  builder {
      enable "Plack::Middleware::AccessLog", format => "combined";


Plack::Middleware::AccessLog forwards the request to the given app and logs request and response details to the logger callback. The format can be specified using Apache-like format strings (or "combined" or "common" for the default formats). If none is specified "combined" is used.

This middleware uses calculable Content-Length by checking body type, and cannot log the time taken to serve requests. It also logs the request before the response is actually sent to the client. Use Plack::Middleware::AccessLog::Timed if you want to log details after the response is transmitted (more like a real web server) to the client.

This middleware is enabled by default when you run plackup as a default "development" environment.



  enable "Plack::Middleware::AccessLog",
      format => '%h %l %u %t "%r" %>s %b "%{Referer}i" "%{User−agent}i"';

Takes a format string (or a preset template "combined" or "custom") to specify the log format. This middleware implements a subset of Apache’s LogFormat templates <>:

   %%    a percent sign
   %h    REMOTE_ADDR from the PSGI environment, or −
   %l    remote logname not implemented (currently always −)
   %u    REMOTE_USER from the PSGI environment, or −
   %t    [local timestamp, in default format]
   %r    REQUEST_METHOD, REQUEST_URI and SERVER_PROTOCOL from the PSGI environment
   %s    the HTTP status code of the response
   %b    content length
   %T    custom field for handling times in subclasses
   %D    custom field for handling sub−second times in subclasses
   %v    SERVER_NAME from the PSGI environment, or −
   %V    HTTP_HOST or SERVER_NAME from the PSGI environment, or −

Some of these format fields are only supported by middleware that subclasses "AccessLog".

In addition, custom values can be referenced, using "%{name}", with one of the mandatory modifier flags "i", "o" or "t":

   %{variable−name}i    HTTP_VARIABLE_NAME value from the PSGI environment
   %{header−name}o      header−name header
   %{time−format]t      localtime in the specified strftime format


  my $logger = Log::Dispatch−>new(...);
  enable "Plack::Middleware::AccessLog",
      logger => sub { $logger−>log(level => 'debug', message => @_) };

Sets a callback to print log message to. It prints to the "psgi.errors" output stream by default.


<> Rack::CustomLogger