RELAY parameter*    ==  RELAY=relayTypeList[:connMap]
     relayTypeList  ==  relayType[,relayType]*
         relayType  ==  proxy | delegate | vhost | no | nojava | noapplet
           connMap  ==  ProtoList:dstHostList:srcHostList
                    --  default: RELAY="delegate,nojava:*:*:.localnet"
                                 RELAY="vhost,nojava:http:{*:80}:.localnet"
                                 RELAY="proxy:*:*:*"

This parameter controls in which way the DeleGate works as a HTTP server. DeleGate as a HTTP proxy server works in two ways (proxying modes): as a standard (CERN compatible) HTTP proxy which accepts full URL in a request ("proxy" relayType), and as a DeleGate original proxy which accepts /-_-URL in a request and rewrites URLs in the response ("delegate" relayType). In a full specification format with ":connMap", available proxying modes can be classified by combination of server protocol, server host and client host.

RELAY="no" means working as an origin HTTP server without relaying (Origin HTTP server is a usual server which accepts requests in usual format, not in format for proxies, that is URL in request is neither in full format nor in "/-_-" format, but in absolute format).

So called "transparent-proxy" ability is enabled by "RELAY=vhost". RELAY="vhost" can be used for origin HTTP server with relaying to arbitrary virtual hosts. This option enables a HTTP request to be forwarded to arbitrary destination server, indicated in "Host:" field in request header, without explicit MOUNT. This automatic relaying is done only when the request URL is not MOUNTed, thus is not so likely because most DeleGate working as origin server have MOUNT parameter for the root URL ("/*").

With "nojava" combined with other relayType, <APPLET>, <EMBED> and <OBJECT> tags relayed in the relayType will be disabled (being replaced with <killed-TagName>). With "noapplet", only <APPLET> tags are disabled. When the relayType "delegate" is enabled by a RELAY parameter, using "nojava" like the default shown above is strongly recommended.

Example:

RELAY=no ... do not work as a proxy (origin server only)
RELAY=proxy ... CERN compatible mode only
RELAY=delegate ... DeleGate mode only (/-_-URL)
RELAY=proxy,delegate ... both CERN and DeleGate mode
RELAY=proxy,noapplet ... inhibit <APPLET> tag to be relayed by proxy

Default:

Both "proxy" and "delegate" modes are allowed to users on ".localnet", while only "proxy" mode is allowed to other users.