squid logformat
version：squid-3.3.11
Usage:
logformat <name> <format specification>
Defines an access log format.
The <format specification> is a string with embedded % format codes
% format codes all follow the same basic structure where all but
the formatcode is optional. Output strings are automatically escaped
as required according to their context and the output format
modifiers are usually not needed, but can be specified if an explicit
output format is desired.
% ["|[|'|#] [-] [[0]width] [{argument}] formatcode
" output in quoted string format
[ output in squid text log format as used by log_mime_hdrs
# output in URL quoted format
' output as-is
- left aligned
width minimum and/or maximum field width:
[width_min][.width_max]
When minimum starts with 0, the field is zero-padded.
String values exceeding maximum width are truncated.
{arg} argument such as header name etc
Format codes:
% a literal % character
sn Unique sequence number per log line entry
err_code The ID of an error response served by Squid or
a similar internal error identifier.
err_detail Additional err_code-dependent error information.
Connection related format codes:
>a Client source IP address
>A Client FQDN
>p Client source port
>eui Client source EUI (MAC address, EUI-48 or EUI-64 identifier)
>la Local IP address the client connected to
>lp Local port number the client connected to
la Local listening IP address the client connection was connected to.
lp Local listening port number the client connection was connected to.
<a Server IP address of the last server or peer connection
<A Server FQDN or peer name
<p Server port number of the last server or peer connection
<la Local IP address of the last server or peer connection
<lp Local port number of the last server or peer connection
Time related format codes:
ts Seconds since epoch
tu subsecond time (milliseconds)
tl Local time. Optional strftime format argument
default %d/%b/%Y:%H:%M:%S %z
tg GMT time. Optional strftime format argument
default %d/%b/%Y:%H:%M:%S %z
tr Response time (milliseconds)
dt Total time spent making DNS lookups (milliseconds)
Access Control related format codes:
et Tag returned by external acl
ea Log string returned by external acl
un User name (any available)
ul User name from authentication
ue User name from external acl helper
ui User name from ident
us User name from SSL
HTTP related format codes:
[http::]>h Original received request header.
Usually differs from the request header sent by
Squid, although most fields are often preserved.
Accepts optional header field name/value filter
argument using name[:[separator]element] format.
[http::]>ha Received request header after adaptation and
redirection (pre-cache REQMOD vectoring point).
Usually differs from the request header sent by
Squid, although most fields are often preserved.
Optional header name argument as for >h
[http::]<h Reply header. Optional header name argument
as for >h
[http::]>Hs HTTP status code sent to the client
[http::]<Hs HTTP status code received from the next hop
[http::]<bs Number of HTTP-equivalent message body bytes
received from the next hop, excluding chunked
transfer encoding and control messages.
Generated FTP/Gopher listings are treated as
received bodies.
[http::]mt MIME content type
[http::]rm Request method (GET/POST etc)
[http::]>rm Request method from client
[http::]<rm Request method sent to server or peer
[http::]ru Request URL from client (historic, filtered for logging)
[http::]>ru Request URL from client
[http::]<ru Request URL sent to server or peer
[http::]rp Request URL-Path excluding hostname
[http::]>rp Request URL-Path excluding hostname from client
[http::]<rp Request URL-Path excluding hostname sento to server or peer
[http::]rv Request protocol version
[http::]>rv Request protocol version from client
[http::]<rv Request protocol version sent to server or peer
[http::]<st Sent reply size including HTTP headers
[http::]>st Received request size including HTTP headers. In the
case of chunked requests the chunked encoding metadata
are not included
[http::]>sh Received HTTP request headers size
[http::]<sh Sent HTTP reply headers size
[http::]st Request+Reply size including HTTP headers
[http::]<sH Reply high offset sent
[http::]<sS Upstream object size
[http::]<pt Peer response time in milliseconds. The timer starts
when the last request byte is sent to the next hop
and stops when the last response byte is received.
[http::]<tt Total server-side time in milliseconds. The timer
starts with the first connect request (or write I/O)
sent to the first selected peer. The timer stops
with the last I/O with the last peer.
Squid handling related format codes:
Ss Squid request status (TCP_MISS etc)
Sh Squid hierarchy status (DEFAULT_PARENT etc)
SSL-related format codes:
ssl::bump_mode SslBump decision for the transaction:
For CONNECT requests that initiated bumping of
a connection and for any request received on
an already bumped connection, Squid logs the
corresponding SslBump mode ("server-first" or
"client-first"). See the ssl_bump option for
more information about these modes.
A "none" token is logged for requests that
triggered "ssl_bump" ACL evaluation matching
either a "none" rule or no rules at all.
In all other cases, a single dash ("-") is
logged.
If ICAP is enabled, the following code becomes available (as
well as ICAP log codes documented with the icap_log option):
icap::tt Total ICAP processing time for the HTTP
transaction. The timer ticks when ICAP
ACLs are checked and when ICAP
transaction is in progress.
If adaptation is enabled the following three codes become available:
adapt::<last_h The header of the last ICAP response or
meta-information from the last eCAP
transaction related to the HTTP transaction.
Like <h, accepts an optional header name
argument.
adapt::sum_trs Summed adaptation transaction response
times recorded as a comma-separated list in
the order of transaction start time. Each time
value is recorded as an integer number,
representing response time of one or more
adaptation (ICAP or eCAP) transaction in
milliseconds. When a failed transaction is
being retried or repeated, its time is not
logged individually but added to the
replacement (next) transaction. See also:
adapt::all_trs.
adapt::all_trs All adaptation transaction response times.
Same as adaptation_strs but response times of
individual transactions are never added
together. Instead, all transaction response
times are recorded individually.
You can prefix adapt::*_trs format codes with adaptation
service name in curly braces to record response time(s) specific
to that service. For example: %{my_service}adapt::sum_trs
If SSL is enabled, the following formating codes become available:
%ssl::>cert_subject The Subject field of the received client
SSL certificate or a dash ('-') if Squid has
received an invalid/malformed certificate or
no certificate at all. Consider encoding the
logged value because Subject often has spaces.
%ssl::>cert_issuer The Issuer field of the received client
SSL certificate or a dash ('-') if Squid has
received an invalid/malformed certificate or
no certificate at all. Consider encoding the
logged value because Issuer often has spaces.
The default formats available (which do not need re-defining) are:
logformat squid %ts.%03tu %6tr %>a %Ss/%03>Hs %<st %rm %ru %[un %Sh/%<a %mt
logformat common %>a %[ui %[un [%tl] "%rm %ru HTTP/%rv" %>Hs %<st %Ss:%Sh
logformat combined %>a %[ui %[un [%tl] "%rm %ru HTTP/%rv" %>Hs %<st "%{Referer}>h" "%{User-Agent}>h" %Ss:%Sh
logformat referrer %ts.%03tu %>a %{Referer}>h %ru
logformat useragent %>a [%tl] "%{User-Agent}>h"
NOTE: When the log_mime_hdrs directive is set to ON.
The squid, common and combined formats have a safely encoded copy
of the mime headers appended to each line within a pair of brackets.
NOTE: The common and combined formats are not quite true to the Apache definition.
The logs from Squid contain an extra status and hierarchy code appended.