Class MultiProxyHandler
- java.lang.Object
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- sunlabs.brazil.handler.GenericProxyHandler
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- sunlabs.brazil.handler.MultiProxyHandler
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- All Implemented Interfaces:
Handler
public class MultiProxyHandler extends GenericProxyHandler
Handler for permitting multiple cross connected virtual web sites. Each handler instance adds its prefix and destination to a static hashtable so the URL rewrite rules rewrite all of them correctly.The
GenericProxyHandler
rewrites all of the links in each wepage to point back to the local. machine. Using this handler, if multiple virtual websites are configured, then links in one site that point to other virtual web sites are rewritten to point locally as well.For example, suppose we have 2 MultiProxyhandlers A and B configured into the server as:
A.prefix=/foo/
A.host=www.foo.com
B.prefix=/bar/
B.host=www.bar.com
./foo/bar/test.html
will fetchhttp://www.foo.com/bar/test.html
. If the result is an html page, then any links in that page that resolve towww.foo.com/...
will be rewritten to the local server as/foo/...
, and any links that points towww.bar.com/...
will be rewritten to/bar/...
.- Version:
- 2.3, 07/03/21
- Author:
- Stephen Uhler
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Field Summary
Fields Modifier and Type Field Description static java.util.Hashtable
proxies
Holds all proxy -> prefix mappings for this server.-
Fields inherited from class sunlabs.brazil.handler.GenericProxyHandler
host, HOST, mapper, NL, noErrorReturn, passHost, port, PORT, prefix, PREFIX, PROXY_HOST, PROXY_PORT, proxyHost, proxyPort, requestPrefix, tokens, urlPrefix
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Constructor Summary
Constructors Constructor Description MultiProxyHandler()
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description boolean
init(Server server, java.lang.String prefix)
Initialize this handler.boolean
respond(Request request)
If this is one of "our" url's, fetch the document from the destination server, and return it as if it was local.-
Methods inherited from class sunlabs.brazil.handler.GenericProxyHandler
getMapper, isMine, modifyContent, shouldFilter
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Method Detail
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init
public boolean init(Server server, java.lang.String prefix)
Initialize this handler. Add rewrite mapping into the global table. If any "virtual" web sites reference other "virtual" web sites, then rewrite the links accordingly.- Specified by:
init
in interfaceHandler
- Overrides:
init
in classGenericProxyHandler
- Parameters:
server
- The HTTP server that created thisHandler
. TypicalHandler
s will useServer.props
to obtain run-time configuration information.prefix
- The handlers name. The string thisHandler
may prepend to all of the keys that it uses to extract configuration information fromServer.props
. This is set (by theServer
andChainHandler
) to help avoid configuration parameter namespace collisions.- Returns:
true
if thisHandler
initialized successfully,false
otherwise. Iffalse
is returned, thisHandler
should not be used.
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respond
public boolean respond(Request request) throws java.io.IOException
Description copied from class:GenericProxyHandler
If this is one of "our" url's, fetch the document from the destination server, and return it as if it was local.- Specified by:
respond
in interfaceHandler
- Overrides:
respond
in classGenericProxyHandler
- Parameters:
request
- TheRequest
object that represents the HTTP request.- Returns:
true
if the request was handled. A request was handled if a response was supplied to the client, typically by callingRequest.sendResponse()
orRequest.sendError
.- Throws:
java.io.IOException
- if there was an I/O error while sending the response to the client. Typically, in that case, theServer
will (try to) send an error message to the client and then close the client's connection.The
IOException
should not be used to silently ignore problems such as being unable to access some server-side resource (for example getting aFileNotFoundException
due to not being able to open a file). In that case, theHandler
's duty is to turn thatIOException
into a HTTP response indicating, in this case, that a file could not be found.
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