mirrors/haproxy
1
0
Fork 0
mirror of https://git.haproxy.org/git/haproxy.git/ synced 2025-11-29 14:50:59 +01:00
Code Issues Projects Releases Wiki Activity

[DOC] remove several trailing spaces

Browse Source
This commit is contained in:
Willy Tarreau 2010-01-12 10:42:19 +01:00
parent 983e01ed86
commit d72758ded1
1 changed files with 46 additions and 46 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

92
doc/configuration.txt
View File

@ -156,7 +156,7 @@ with cookie insertion.
First, let's consider this HTTP request : First, let's consider this HTTP request :
Line Contents Line Contents
number number
1 GET /serv/login.php?lang=en&profile=2 HTTP/1.1 1 GET /serv/login.php?lang=en&profile=2 HTTP/1.1
2 Host: www.mydomain.com 2 Host: www.mydomain.com
3 User-agent: my small browser 3 User-agent: my small browser
@ -202,7 +202,7 @@ The URI itself can have several forms :
- a star ('*') : this form is only accepted in association with the OPTIONS - a star ('*') : this form is only accepted in association with the OPTIONS
method and is not relayable. It is used to inquiry a next hop's method and is not relayable. It is used to inquiry a next hop's
capabilities. capabilities.
- an address:port combination : 192.168.0.12:80 - an address:port combination : 192.168.0.12:80
This is used with the CONNECT method, which is used to establish TCP This is used with the CONNECT method, which is used to establish TCP
tunnels through HTTP proxies, generally for HTTPS, but sometimes for tunnels through HTTP proxies, generally for HTTPS, but sometimes for
@ -254,7 +254,7 @@ An HTTP response looks very much like an HTTP request. Both are called HTTP
messages. Let's consider this HTTP response : messages. Let's consider this HTTP response :
Line Contents Line Contents
number number
1 HTTP/1.1 200 OK 1 HTTP/1.1 200 OK
2 Content-length: 350 2 Content-length: 350
3 Content-Type: text/html 3 Content-Type: text/html
@ -288,7 +288,7 @@ The status code is always 3-digit. The first digit indicates a general status :
- 5xx = error caused by the server (eg: 500, 502, 503) - 5xx = error caused by the server (eg: 500, 502, 503)
Please refer to RFC2616 for the detailed meaning of all such codes. The Please refer to RFC2616 for the detailed meaning of all such codes. The
"reason" field is just a hint, but is not parsed by clients. Anything can be "reason" field is just a hint, but is not parsed by clients. Anything can be
found there, but it's a common practice to respect the well-established found there, but it's a common practice to respect the well-established
messages. It can be composed of one or multiple words, such as "OK", "Found", messages. It can be composed of one or multiple words, such as "OK", "Found",
or "Authentication Required". or "Authentication Required".
@ -385,7 +385,7 @@ The following keywords are supported in the "global" section :
- stats - stats
- node - node
- description - description
* Performance tuning * Performance tuning
- maxconn - maxconn
- maxpipes - maxpipes
@ -399,7 +399,7 @@ The following keywords are supported in the "global" section :
- tune.maxaccept - tune.maxaccept
- tune.maxpollevents - tune.maxpollevents
- tune.maxrewrite - tune.maxrewrite
* Debugging * Debugging
- debug - debug
- quiet - quiet
@ -415,7 +415,7 @@ chroot <jail dir>
attacker to exploit the system. This only works when the process is started attacker to exploit the system. This only works when the process is started
with superuser privileges. It is important to ensure that <jail_dir> is both with superuser privileges. It is important to ensure that <jail_dir> is both
empty and unwritable to anyone. empty and unwritable to anyone.
daemon daemon
Makes the process fork into background. This is the recommended mode of Makes the process fork into background. This is the recommended mode of
operation. It is equivalent to the command line "-D" argument. It can be operation. It is equivalent to the command line "-D" argument. It can be
@ -426,11 +426,11 @@ gid <number>
ID is dedicated to HAProxy or to a small set of similar daemons. HAProxy must ID is dedicated to HAProxy or to a small set of similar daemons. HAProxy must
be started with a user belonging to this group, or with superuser privileges. be started with a user belonging to this group, or with superuser privileges.
See also "group" and "uid". See also "group" and "uid".
group <group name> group <group name>
Similar to "gid" but uses the GID of group name <group name> from /etc/group. Similar to "gid" but uses the GID of group name <group name> from /etc/group.
See also "gid" and "user". See also "gid" and "user".
log <address> <facility> [max level [min level]] log <address> <facility> [max level [min level]]
Adds a global syslog server. Up to two global servers can be defined. They Adds a global syslog server. Up to two global servers can be defined. They
will receive logs for startups and exits, as well as all logs from proxies will receive logs for startups and exits, as well as all logs from proxies
@ -711,12 +711,12 @@ specified in a previous "defaults" section.
keyword defaults frontend listen backend keyword defaults frontend listen backend
----------------------+----------+----------+---------+--------- ----------------------+----------+----------+---------+---------
acl - X X X acl - X X X
appsession - - X X appsession - - X X
backlog X X X - backlog X X X -
balance X - X X balance X - X X
bind - X X - bind - X X -
bind-process X X X X bind-process X X X X
block - X X X block - X X X
capture cookie - X X - capture cookie - X X -
capture request header - X X - capture request header - X X -
@ -1486,7 +1486,7 @@ contimeout <timeout>
If the server is located on the same LAN as haproxy, the connection should be If the server is located on the same LAN as haproxy, the connection should be
immediate (less than a few milliseconds). Anyway, it is a good practice to immediate (less than a few milliseconds). Anyway, it is a good practice to
cover one or several TCP packet losses by specifying timeouts that are cover one or several TCP packet losses by specifying timeouts that are
slightly above multiples of 3 seconds (eg: 4 or 5 seconds). By default, the slightly above multiples of 3 seconds (eg: 4 or 5 seconds). By default, the
connect timeout also presets the queue timeout to the same value if this one connect timeout also presets the queue timeout to the same value if this one
has not been specified. Historically, the contimeout was also used to set the has not been specified. Historically, the contimeout was also used to set the
@ -2141,7 +2141,7 @@ no option abortonclose
the response. However, this introduces risks of congestion when lots of users the response. However, this introduces risks of congestion when lots of users
do the same, and is completely useless nowadays because probably no client at do the same, and is completely useless nowadays because probably no client at
all will close the session while waiting for the response. Some HTTP agents all will close the session while waiting for the response. Some HTTP agents
support this behaviour (Squid, Apache, HAProxy), and others do not (TUX, most support this behaviour (Squid, Apache, HAProxy), and others do not (TUX, most
hardware-based load balancers). So the probability for a closed input channel hardware-based load balancers). So the probability for a closed input channel
to represent a user hitting the "STOP" button is close to 100%, and the risk to represent a user hitting the "STOP" button is close to 100%, and the risk
of being the single component to break rare but valid traffic is extremely of being the single component to break rare but valid traffic is extremely
@ -2156,7 +2156,7 @@ no option abortonclose
during the connection establishment if the server has not yet acknowledged during the connection establishment if the server has not yet acknowledged
the connection request. This considerably reduces the queue size and the load the connection request. This considerably reduces the queue size and the load
on saturated servers when users are tempted to click on STOP, which in turn on saturated servers when users are tempted to click on STOP, which in turn
reduces the response time for other users. reduces the response time for other users.
If this option has been enabled in a "defaults" section, it can be disabled If this option has been enabled in a "defaults" section, it can be disabled
in a specific instance by prepending the "no" keyword before it. in a specific instance by prepending the "no" keyword before it.
@ -2434,7 +2434,7 @@ option forwardfor [ except <network> ] [ header <name> ]
<network> is an optional argument used to disable this option for sources <network> is an optional argument used to disable this option for sources
matching <network> matching <network>
<name> an optional argument to specify a different "X-Forwarded-For" <name> an optional argument to specify a different "X-Forwarded-For"
header name. header name.
Since HAProxy works in reverse-proxy mode, the servers see its IP address as Since HAProxy works in reverse-proxy mode, the servers see its IP address as
their client address. This is sometimes annoying when the client's IP address their client address. This is sometimes annoying when the client's IP address
@ -2447,10 +2447,10 @@ option forwardfor [ except <network> ] [ header <name> ]
that only the last occurrence of the header must be used, since it is really that only the last occurrence of the header must be used, since it is really
possible that the client has already brought one. possible that the client has already brought one.
The keyword "header" may be used to supply a different header name to replace The keyword "header" may be used to supply a different header name to replace
the default "X-Forwarded-For". This can be useful where you might already the default "X-Forwarded-For". This can be useful where you might already
have a "X-Forwarded-For" header from a different application (eg: stunnel), have a "X-Forwarded-For" header from a different application (eg: stunnel),
and you need preserve it. Also if your backend server doesn't use the and you need preserve it. Also if your backend server doesn't use the
"X-Forwarded-For" header and requires different one (eg: Zeus Web Servers "X-Forwarded-For" header and requires different one (eg: Zeus Web Servers
require "X-Cluster-Client-IP"). require "X-Cluster-Client-IP").
@ -2928,7 +2928,7 @@ no option redispatch
It also allows to retry last connection to another server in case of multiple It also allows to retry last connection to another server in case of multiple
connection failures. Of course, it requires having "retries" set to a nonzero connection failures. Of course, it requires having "retries" set to a nonzero
value. value.
This form is the preferred form, which replaces both the "redispatch" and This form is the preferred form, which replaces both the "redispatch" and
"redisp" keywords. "redisp" keywords.
@ -2943,7 +2943,7 @@ option smtpchk <hello> <domain>
Use SMTP health checks for server testing Use SMTP health checks for server testing
May be used in sections : defaults | frontend | listen | backend May be used in sections : defaults | frontend | listen | backend
yes | no | yes | yes yes | no | yes | yes
Arguments : Arguments :
<hello> is an optional argument. It is the "hello" command to use. It can <hello> is an optional argument. It is the "hello" command to use. It can
be either "HELO" (for SMTP) or "EHLO" (for ESTMP). All other be either "HELO" (for SMTP) or "EHLO" (for ESTMP). All other
values will be turned into the default command ("HELO"). values will be turned into the default command ("HELO").
@ -3442,7 +3442,7 @@ redispatch (deprecated)
It also allows to retry last connection to another server in case of multiple It also allows to retry last connection to another server in case of multiple
connection failures. Of course, it requires having "retries" set to a nonzero connection failures. Of course, it requires having "retries" set to a nonzero
value. value.
This form is deprecated, do not use it in any new configuration, use the new This form is deprecated, do not use it in any new configuration, use the new
"option redispatch" instead. "option redispatch" instead.
@ -3486,7 +3486,7 @@ reqiallow <search> (ignore case)
<search> will mark the request as allowed, even if any later test would <search> will mark the request as allowed, even if any later test would
result in a deny. The test applies both to the request line and to request result in a deny. The test applies both to the request line and to request
headers. Keep in mind that URLs in request line are case-sensitive while headers. Keep in mind that URLs in request line are case-sensitive while
header names are not. header names are not.
It is easier, faster and more powerful to use ACLs to write access policies. It is easier, faster and more powerful to use ACLs to write access policies.
Reqdeny, reqallow and reqpass should be avoided in new designs. Reqdeny, reqallow and reqpass should be avoided in new designs.
@ -3549,11 +3549,11 @@ reqideny <search> (ignore case)
<search> will mark the request as denied, even if any later test would <search> will mark the request as denied, even if any later test would
result in an allow. The test applies both to the request line and to request result in an allow. The test applies both to the request line and to request
headers. Keep in mind that URLs in request line are case-sensitive while headers. Keep in mind that URLs in request line are case-sensitive while
header names are not. header names are not.
A denied request will generate an "HTTP 403 forbidden" response once the A denied request will generate an "HTTP 403 forbidden" response once the
complete request has been parsed. This is consistent with what is practiced complete request has been parsed. This is consistent with what is practiced
using ACLs. using ACLs.
It is easier, faster and more powerful to use ACLs to write access policies. It is easier, faster and more powerful to use ACLs to write access policies.
Reqdeny, reqallow and reqpass should be avoided in new designs. Reqdeny, reqallow and reqpass should be avoided in new designs.
@ -3982,7 +3982,7 @@ srvtimeout <timeout> (deprecated)
order to avoid complex situations to debug. Whatever the expected server order to avoid complex situations to debug. Whatever the expected server
response times, it is a good practice to cover at least one or several TCP response times, it is a good practice to cover at least one or several TCP
packet losses by specifying timeouts that are slightly above multiples of 3 packet losses by specifying timeouts that are slightly above multiples of 3
seconds (eg: 4 or 5 seconds minimum). seconds (eg: 4 or 5 seconds minimum).
This parameter is specific to backends, but can be specified once for all in This parameter is specific to backends, but can be specified once for all in
"defaults" sections. This is in fact one of the easiest solutions not to "defaults" sections. This is in fact one of the easiest solutions not to
@ -4459,7 +4459,7 @@ tcp-request inspect-delay <timeout>
For most protocols, it is enough to set it to a few seconds, as most clients For most protocols, it is enough to set it to a few seconds, as most clients
send the full request immediately upon connection. Add 3 or more seconds to send the full request immediately upon connection. Add 3 or more seconds to
cover TCP retransmits but that's all. For some protocols, it may make sense cover TCP retransmits but that's all. For some protocols, it may make sense
to use large values, for instance to ensure that the client never talks to use large values, for instance to ensure that the client never talks
before the server (eg: SMTP), or to wait for a client to talk before passing before the server (eg: SMTP), or to wait for a client to talk before passing
data to the server (eg: SSL). Note that the client timeout must cover at data to the server (eg: SSL). Note that the client timeout must cover at
least the inspection delay, otherwise it will expire first. least the inspection delay, otherwise it will expire first.
@ -4549,7 +4549,7 @@ timeout contimeout <timeout> (deprecated)
If the server is located on the same LAN as haproxy, the connection should be If the server is located on the same LAN as haproxy, the connection should be
immediate (less than a few milliseconds). Anyway, it is a good practice to immediate (less than a few milliseconds). Anyway, it is a good practice to
cover one or several TCP packet losses by specifying timeouts that are cover one or several TCP packet losses by specifying timeouts that are
slightly above multiples of 3 seconds (eg: 4 or 5 seconds). By default, the slightly above multiples of 3 seconds (eg: 4 or 5 seconds). By default, the
connect timeout also presets both queue and tarpit timeouts to the same value connect timeout also presets both queue and tarpit timeouts to the same value
if these have not been specified. if these have not been specified.
@ -4695,7 +4695,7 @@ timeout srvtimeout <timeout> (deprecated)
order to avoid complex situations to debug. Whatever the expected server order to avoid complex situations to debug. Whatever the expected server
response times, it is a good practice to cover at least one or several TCP response times, it is a good practice to cover at least one or several TCP
packet losses by specifying timeouts that are slightly above multiples of 3 packet losses by specifying timeouts that are slightly above multiples of 3
seconds (eg: 4 or 5 seconds minimum). seconds (eg: 4 or 5 seconds minimum).
This parameter is specific to backends, but can be specified once for all in This parameter is specific to backends, but can be specified once for all in
"defaults" sections. This is in fact one of the easiest solutions not to "defaults" sections. This is in fact one of the easiest solutions not to
@ -4728,7 +4728,7 @@ timeout tarpit <timeout>
unit if the number is suffixed by the unit, as specified at the top of this unit if the number is suffixed by the unit, as specified at the top of this
document. If unspecified, the same value as the backend's connection timeout document. If unspecified, the same value as the backend's connection timeout
("timeout connect") is used, for backwards compatibility with older versions ("timeout connect") is used, for backwards compatibility with older versions
with no "timeout tapit" parameter. with no "timeout tapit" parameter.
See also : "timeout connect", "contimeout". See also : "timeout connect", "contimeout".
@ -4792,7 +4792,7 @@ use_backend <backend> unless <condition>
must decode several protocols on a unique port, one of them being HTTP. must decode several protocols on a unique port, one of them being HTTP.
See also: "default_backend", "tcp-request", and section 7 about ACLs. See also: "default_backend", "tcp-request", and section 7 about ACLs.
5. Server and default-server options 5. Server and default-server options
----------------- -----------------
@ -4896,7 +4896,7 @@ downinter <delay>
---------------------------------+----------------------------------------- ---------------------------------+-----------------------------------------
DOWN 100% (non-transitional) | "downinter" if set, "inter" otherwise. DOWN 100% (non-transitional) | "downinter" if set, "inter" otherwise.
---------------------------------+----------------------------------------- ---------------------------------+-----------------------------------------
Just as with every other time-based parameter, they can be entered in any Just as with every other time-based parameter, they can be entered in any
other explicit unit among { us, ms, s, m, h, d }. The "inter" parameter also other explicit unit among { us, ms, s, m, h, d }. The "inter" parameter also
serves as a timeout for health checks sent to servers if "timeout check" is serves as a timeout for health checks sent to servers if "timeout check" is
@ -5171,7 +5171,7 @@ Notes related to these keywords :
- req* statements are applied after "block" statements, so that "block" is - req* statements are applied after "block" statements, so that "block" is
always the first one, but before "use_backend" in order to permit rewriting always the first one, but before "use_backend" in order to permit rewriting
before switching. before switching.
7. Using ACLs 7. Using ACLs
@ -5428,7 +5428,7 @@ fe_sess_rate(frontend) <integer>
tcp-request inspect-delay 100ms tcp-request inspect-delay 100ms
tcp-request content accept if ! too_fast tcp-request content accept if ! too_fast
tcp-request content accept if WAIT_END tcp-request content accept if WAIT_END
be_sess_rate <integer> be_sess_rate <integer>
be_sess_rate(backend) <integer> be_sess_rate(backend) <integer>
Returns true when the sessions creation rate on the backend matches the Returns true when the sessions creation rate on the backend matches the
@ -5614,7 +5614,7 @@ url_port <integer>
"http_proxy". Note that if the port is not specified in the request, port 80 "http_proxy". Note that if the port is not specified in the request, port 80
is assumed. is assumed.
hdr <string> hdr <string>
hdr(header) <string> hdr(header) <string>
Note: all the "hdr*" matching criteria either apply to all headers, or to a Note: all the "hdr*" matching criteria either apply to all headers, or to a
particular header whose name is passed between parenthesis and without any particular header whose name is passed between parenthesis and without any
@ -6079,7 +6079,7 @@ with a star ('*') after the field name below.
>>> Feb 6 12:14:14 localhost \ >>> Feb 6 12:14:14 localhost \
haproxy[14389]: 10.0.1.2:33317 [06/Feb/2009:12:14:14.655] http-in \ haproxy[14389]: 10.0.1.2:33317 [06/Feb/2009:12:14:14.655] http-in \
static/srv1 10/0/30/69/109 200 2750 - - ---- 1/1/1/1/0 0/0 {1wt.eu} \ static/srv1 10/0/30/69/109 200 2750 - - ---- 1/1/1/1/0 0/0 {1wt.eu} \
{} "GET /index.html HTTP/1.1" {} "GET /index.html HTTP/1.1"
Field Format Extract from the example above Field Format Extract from the example above
1 process_name '[' pid ']:' haproxy[14389]: 1 process_name '[' pid ']:' haproxy[14389]:
@ -6098,7 +6098,7 @@ with a star ('*') after the field name below.
14 '{' captured_request_headers* '}' {haproxy.1wt.eu} 14 '{' captured_request_headers* '}' {haproxy.1wt.eu}
15 '{' captured_response_headers* '}' {} 15 '{' captured_response_headers* '}' {}
16 '"' http_request '"' "GET /index.html HTTP/1.1" 16 '"' http_request '"' "GET /index.html HTTP/1.1"
Detailed fields description : Detailed fields description :
- "client_ip" is the IP address of the client which initiated the TCP - "client_ip" is the IP address of the client which initiated the TCP
@ -6622,7 +6622,7 @@ easier finding and understanding.
by network routing issues between the client and haproxy, or by a by network routing issues between the client and haproxy, or by a
keep-alive session between the server and the client terminated first keep-alive session between the server and the client terminated first
by the client. by the client.
cD The client did not send nor acknowledge any data for as long as the cD The client did not send nor acknowledge any data for as long as the
"timeout client" delay. This is often caused by network failures on "timeout client" delay. This is often caused by network failures on
the client side, or the client simply leaving the net uncleanly. the client side, or the client simply leaving the net uncleanly.
@ -6844,14 +6844,14 @@ in the logs.
haproxy[2022]: 127.0.0.1:34020 [09/Aug/2004:20:30:46] proxy-out \ haproxy[2022]: 127.0.0.1:34020 [09/Aug/2004:20:30:46] proxy-out \
proxy-out/cache1 0/0/0/182/+182 200 +279 - - ---- 0/0/0/0/0 0/0 \ proxy-out/cache1 0/0/0/182/+182 200 +279 - - ---- 0/0/0/0/0 0/0 \
{w.ods.org||} {Formilux/0.1.8|3495|||} \ {w.ods.org||} {Formilux/0.1.8|3495|||} \
"GET http://trafic.1wt.eu/ HTTP/1.1" "GET http://trafic.1wt.eu/ HTTP/1.1"
>>> Aug 9 20:30:46 localhost \ >>> Aug 9 20:30:46 localhost \
haproxy[2022]: 127.0.0.1:34028 [09/Aug/2004:20:30:46] proxy-out \ haproxy[2022]: 127.0.0.1:34028 [09/Aug/2004:20:30:46] proxy-out \
proxy-out/cache1 0/0/2/126/+128 301 +223 - - ---- 0/0/0/0/0 0/0 \ proxy-out/cache1 0/0/2/126/+128 301 +223 - - ---- 0/0/0/0/0 0/0 \
{www.sytadin.equipement.gouv.fr||http://trafic.1wt.eu/} \ {www.sytadin.equipement.gouv.fr||http://trafic.1wt.eu/} \
{Apache|230|||http://www.sytadin.} \ {Apache|230|||http://www.sytadin.} \
"GET http://www.sytadin.equipement.gouv.fr/ HTTP/1.1" "GET http://www.sytadin.equipement.gouv.fr/ HTTP/1.1"
8.9. Examples of logs 8.9. Examples of logs
@ -6896,7 +6896,7 @@ reading. Their sole purpose is to explain how to decipher them.
to return the 502 and not the server. to return the 502 and not the server.
>>> haproxy[18113]: 127.0.0.1:34548 [15/Oct/2003:15:18:55.798] px-http \ >>> haproxy[18113]: 127.0.0.1:34548 [15/Oct/2003:15:18:55.798] px-http \
px-http/<NOSRV> -1/-1/-1/-1/8490 -1 0 - - CR-- 2/2/2/0/0 0/0 "" px-http/<NOSRV> -1/-1/-1/-1/8490 -1 0 - - CR-- 2/2/2/0/0 0/0 ""
=> the client never completed its request and aborted itself ("C---") after => the client never completed its request and aborted itself ("C---") after
8.5s, while the proxy was waiting for the request headers ("-R--"). 8.5s, while the proxy was waiting for the request headers ("-R--").
@ -6918,7 +6918,7 @@ reading. Their sole purpose is to explain how to decipher them.
>>> haproxy[18989]: 10.0.0.1:34552 [15/Oct/2003:15:26:31.462] px-http \ >>> haproxy[18989]: 10.0.0.1:34552 [15/Oct/2003:15:26:31.462] px-http \
px-http/srv1 3183/-1/-1/-1/11215 503 0 - - SC-- 205/202/202/115/3 \ px-http/srv1 3183/-1/-1/-1/11215 503 0 - - SC-- 205/202/202/115/3 \
0/0 "HEAD / HTTP/1.0" 0/0 "HEAD / HTTP/1.0"
=> The request took 3s to complete (probably a network problem), and the => The request took 3s to complete (probably a network problem), and the
connection to the server failed ('SC--') after 4 attempts of 2 seconds connection to the server failed ('SC--') after 4 attempts of 2 seconds
@ -6991,12 +6991,12 @@ page. Both means provide a CSV format whose fields follow.
(tcp rst) or "No route to host" (icmp) (tcp rst) or "No route to host" (icmp)
L6OK -> check passed on layer 6 L6OK -> check passed on layer 6
L6TOUT -> layer 6 (SSL) timeout L6TOUT -> layer 6 (SSL) timeout
L6RSP -> layer 6 invalid response - protocol error L6RSP -> layer 6 invalid response - protocol error
L7OK -> check passed on layer 7 L7OK -> check passed on layer 7
L7OKC -> check conditionally passed on layer 7, for example 404 with L7OKC -> check conditionally passed on layer 7, for example 404 with
disable-on-404 disable-on-404
L7TOUT -> layer 7 (HTTP/SMTP) timeout L7TOUT -> layer 7 (HTTP/SMTP) timeout
L7RSP -> layer 7 invalid response - protocol error L7RSP -> layer 7 invalid response - protocol error
L7STS -> layer 7 response error, for example HTTP 5xx L7STS -> layer 7 response error, for example HTTP 5xx
37. check_code: layer5-7 code, if available 37. check_code: layer5-7 code, if available
38. check_duration: time in ms took to finish last health check 38. check_duration: time in ms took to finish last health check