Coyote Point Systems Equalizer Spezifikationen PDF herunterladen (Seite 331)

Accept-Language If-Modified-Since Transfer-Encoding

Authorization If-None-Match Upgrade

Cache-Control If-Range User-Agent

Connection If-Unmodified-Since Via

Content-Length Max-Forwards Warning

Cookie Pragma X-Forwarded-For

Date Proxy-Authorization

Expect Range

HTTPS Protocol Matching

Equalizer permits the construction of virtual clusters running the HTTPS protocol. HTTPS is HTTP running over an encrypted

transport, typically SSL version 2.0 or 3.0 or TLS version 1.0. All of the functions available for load balancing HTTP clusters

are available for HTTPS clusters. In addition, there are some additional match functions [ssl2(), ssl3(), and tls1()], that match

against the protocol specified in an HTTPS request.

Supported Characters in URIs

The characters permitted in a URI are defined in RFC2396. Equalizer supports all characters defined in the

standard for all Match Functions that have a URI as an argument. Note in particular that the ASCII space

character is not permitted in URIs -- it is required to be encoded by all conforming browsers as “%20” (see Section

2.4 of RFC2396).

Match Rules, the Once Only Flag, and Cookies

Since multiple client requests may be received on a single TCP/IP connection, Equalizer has a flag (once only)

that specifies whether to check the headers in every request received on a connection, or to load balance based

solely The once only flag is a cluster parameter on the Networking tab. When using Match Rules, it is usually

desirable to turn off the once only flag for the cluster so that Equalizer matches against each individual request in

a connection, not just the first one.

You can also enable or disable once only flag in the match rule Configuration screen (tab), to override the setting

on the cluster for any request that matches that rule. For example, if once only is enabled on a cluster and

disabled on a match rule, any request that matches that match rule’s expression will be load balanced as if once

only were disabled on the cluster.

The following table shows how the setting of once only affects load balancing when a match rule hit occurs:

match rule hit on... once only disabled once only enabled

...the first request on

a connection

If the request headerscontain a cookie

specifying a server in the match rule’s server list,

send the request to the server in the cookie.

Otherwise, send the request to the server in the

match rule’s server list that is selected by the

load balancing policyin effect for the match rule.

Same as at left.

...second and

subsequent requests

Same as above.

If the request headerscontain a cookie

specifying a server in the match rule’s server

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Equalizer Administration Guide

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