Logging¶
aiohttp uses standard logging
for tracking the
library activity.
We have the following loggers enumerated by names:
'aiohttp.access'
'aiohttp.client'
'aiohttp.internal'
'aiohttp.server'
'aiohttp.web'
'aiohttp.websocket'
You may subscribe to these loggers for getting logging messages. The
page does not provide instructions for logging subscribing while the
most friendly method is logging.config.dictConfig()
for
configuring whole loggers in your application.
Access logs¶
Access log by default is switched on and uses 'aiohttp.access'
logger name.
The log may be controlled by aiohttp.web.Application.make_handler()
call.
Pass access_log parameter with value of logging.Logger
instance to override default logger.
Note
Use app.make_handler(access_log=None)
for disabling access logs.
Other parameter called access_log_format may be used for specifying log format (see below).
Format specification¶
The library provides custom micro-language to specifying info about request and response:
Option | Meaning |
---|---|
%% |
The percent sign |
%a |
Remote IP-address (IP-address of proxy if using reverse proxy) |
%t |
Time when the request was started to process |
%P |
The process ID of the child that serviced the request |
%r |
First line of request |
%s |
Response status code |
%b |
Size of response in bytes, excluding HTTP headers |
%O |
Bytes sent, including headers |
%T |
The time taken to serve the request, in seconds |
%Tf |
The time taken to serve the request, in seconds with fraction in %.06f format |
%D |
The time taken to serve the request, in microseconds |
%{FOO}i |
request.headers['FOO'] |
%{FOO}o |
response.headers['FOO'] |
%{FOO}e |
os.environ['FOO'] |
Default access log format is:
'%a %l %u %t "%r" %s %b "%{Referrer}i" "%{User-Agent}i"'
Error logs¶
aiohttp.web uses logger named 'aiohttp.server'
to store errors
given on web requests handling.
The log is enabled by default.
To use different logger name please specify logger parameter
(logging.Logger
instance) on performing
aiohttp.web.Application.make_handler()
call.