Coyote Point Systems Equalizer Spezifikationen PDF herunterladen (Seite 324)

Match Rules

Match Rule Functions

Match rule

functions

generally test for certain strings or settings in the headers and URI of a client request. In the

table below, we first discuss match rule functions that examine information in the request other than the URI, and

then we discuss the URI related functions.

The following table lists the non-URI functions supported by Equalizer match rules:

any()

This function always evaluates to true -- that is, this function matches any

incoming request.

client_ip(string)

This function evaluates to true only if the IP address of the client machine

making the connection matches the string argument.

The string can be a simple IP address (e.g., “192.168.1.110”), or an IP

address in Classless Inter-Domain Routing (CIDR) notation (e.g.,

“192.168.1.0/24”). This function can be useful in restricting match

expressions to a particular client or group of clients, which can aid in

debugging a new match rule when a cluster is in production. Only the

specified clients match the rule, leaving other clients to be handled by

other match rules

debug_message(string)

This function always evaluates to true. It writes the string argument to

the Event Log for the cluster (View > Event Log). This function can be

logically ANDed and ORed with other functions to write debug messages.

Use this function for testing and debugging only. Do not use it in

production environments, since it has a negative impact on performance.

ignore_case()

This function always evaluates to true, and is intended to be used to apply

the ignore_case flag for comparisons when it is not set on the cluster.

When this function is ANDed with other functions, it has the effect of

forcing case to be ignored for any comparisons done by the match rule.

observe_case()

This function always evaluates to true, and is intended to be used to

override the ignore_case flag for comparisons when it is set on a cluster.

When this function is ANDed with other functions, it has the effect of

forcing case to be honored for any comparisons done by the match rule.

http_09()

This function takes no arguments and evaluates to true if the HTTP

protocol used by the request appears to be HTTP 0.9. This is done by

inference: if an explicit protocol level is absent after the request URI, then

the request is considered HTTP 0.9.

method(string)

This function evaluates to true if the string argument exactly matches the

Request Method (e.g., GET, POST, etc.) specified in the request. Note that

by default Equalizer forwards packets to servers without determining

whether or not the method specified in the request is valid (i.e., is a

method specified in Section 9 of RFC2616). One use of the method()

function is to be able to override this default behavior and prevent invalid

requests from being forwarded to a server.

ssl2()

HTTPS only. This function evaluates to true if the client negotiated the

encrypted connection using SSL version 2.0.

ssl3()

HTTPS only. This function evaluates to true if the client negotiated the

encrypted connection using SSL version 3.0.

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