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Date: Tue, 17 Jan 2006 13:47:19 +0100
From: Oleg Kalnichevski <olegk@apache.org>
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To: HttpClient User Discussion <httpclient-user@jakarta.apache.org>
Subject: Re: Virtual Host problems
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 <DD48B396E7DBC84388165747BD439E780653D549@MBTCHEXCHANGE.mahindrabt.com>
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 <DD48B396E7DBC84388165747BD439E780653D549@MBTCHEXCHANGE.mahindrabt.com>
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DEEPAK SHETTY wrote:
> Hi
> Thanks.
> 
> The default java implementation thinks differently to httpclient as any
> value of Host can be set including any port value we choose(e.g. you can
> set any value you want using jmeter).

More options do not always make a better system, especially senseless ones

Oleg

> 
> Im not sure what is correct according to the http spec though
> Thanks for the advice
> Regards
> deepak
> 
> 
>>-----Original Message-----
>>From: Oleg Kalnichevski [mailto:olegk@apache.org]
>>Sent: Tuesday, January 17, 2006 5:22 PM
>>To: HttpClient User Discussion
>>Subject: Re: Virtual Host problems
>>
>>DEEPAK SHETTY wrote:
>>
>>>Hi
>>>I realize there is no such thing as a virtual port.
>>>However let me explain.
>>>
>>>There was a MS Proxy system accessed as
>>>
>>>http://externaldns:port1/App1 which would proxy requests to
>>>http://internalip:port2/App1 (A Reverse Proxy like you point out)
>>>The MS Proxy system would add a Host Header as externaldns:port1 and
> 
> the
> 
>>>internal system depended on this host header for reasons best know to
>>>it.
>>>
>>
>>So, you are talking about a *reverse* proxy, aren't you?
>>
>>
>>>Note that port1 != port2 (and there is no reason why it should be)
>>>
>>>Now this MS proxy is being replaced by a java servlet using
> 
> HttpClient
> 
>>>And we are only able to add the host header as externaldns:port2
> 
> using
> 
>>>http client.
>>>
>>>I can't see how the spec can allow the host header ip/dns to be
> 
> changed
> 
>>>but not the port, because this solution always needs the ports to be
>>>same.
>>
>>There is no need to virtualize ports unlike the host names due to the
>>way host names get resolved to an IP address. A process is either
>>listens on a port or it does not. If you are able to show a single
>>reference to a definition of a 'virtual' port in the HTTP spec I will
>>happily change my mind
>>
>>
>>
>>>If you consider bridging reverse proxies where the external DMZ
> 
> reverse
> 
>>>proxy is accessed via HTTPS(443) , but internal network access is
>>>HTTP(80) then too this fails.
>>
>>Why? You just have to adjust the HostConfiguration settings
> 
> accordingly.
> 
>>What does this have to do with 'virtual' ports?
>>
>>
>>>I assume there is no way around this with httpclient then?
>>>
>>
>>Of course, there is. Override the HttpMethodBase#addHostRequestHeader
>>method and provide whatever logic you deem appropriate
>>
>>http://jakarta.apache.org/commons/httpclient/xref/org/apache/commons/ht
> 
> tpcl
> 
>>ient/HttpMethodBase.html#1209
>>
>>It is clearly an ugly abuse of class inheritance but this is as good as
>>it gets until HttpClient 4.0
>>
>>Hope this helps
>>
>>Oleg
>>
>>
>>>Regards
>>>deepak
>>>
>>>
>>>
>>>
>>>
>>>
>>>>-----Original Message-----
>>>>From: Oleg Kalnichevski [mailto:olegk@apache.org]
>>>>Sent: Tuesday, January 17, 2006 4:52 PM
>>>>To: HttpClient User Discussion
>>>>Subject: Re: Virtual Host problems
>>>>
>>>>DEEPAK SHETTY wrote:
>>>>
>>>>
>>>>>Hi
>>>>>We have a proxy servlet which proxies requests to downstream servers
>>>
>>>and
>>>
>>>
>>>>>we use HttpClient to implement the proxy. We need to pass the Host
>>>
>>>and
>>>
>>>
>>>>>Port that the user had requested for as the Host header to the
>>>>>downstream system (which is not aware of the proxy) so
>>>>>Client -->ProxyServer(http-client)-->DownStream
>>>>>		192.168.0.254(80)	    --> yadayada:8081
>>>>>						Host header
>>>>>wanted(192.168.0.254:80)
>>>>>
>>>>>Now I can use VirtualHost to specify the Host name , but theres no
>>>
>>>way
>>>
>>>
>>>>>to specify the port
>>>>>
>>>
>>>
> (http://www.mail-archive.com/httpclient-user@jakarta.apache.org/msg01357
> 
>>>>>.html)
>>>>>Or to use the example from the thread
>>>>>
>>>>>IP: 192.168.0.254
>>>>>
>>>>>virtual-host1: yadayada:8081
>>>>>virtual-host2: blahblah:8082
>>>>>
>>>>>In order to get a resource form the virtual-host1 do:
>>>>>bind to 192.168.0.254:8081
>>>>>GET /some/stuff HTTP/1.1
>>>>>Host: yadayada:8081
>>>>>
>>>>>In order to get a resource from the virtual-host2 do:
>>>>>bind to 192.168.0.254:8082
>>>>>GET /some/stuff HTTP/1.1
>>>>>Host: blahblah:8082
>>>>>
>>>>>However we need the proxy to listen on 192.168.0.254 port 80 (and
> 
> not
> 
>>>>>8081 or 8082)
>>>>>
>>>>>Are there any workarounds possible?
>>>>>Regards
>>>>>deepak
>>>>>
>>>>
>>>>Deepak,
>>>>There is no such thing as a virtual port.
>>>>
>>>>If the servlet you are writing indeed acts as an HTTP proxy (not to
> 
> be
> 
>>>>confused with a reverse HTTP proxy), then by the HTTP spec requests
>>>
>>>sent
>>>
>>>
>>>>by the clients to the proxy are supposed to look like that
>>>>
>>>>bind to 192.168.0.254:80
>>>>GET http://yadayada:8081/some/stuff HTTP/1.1
>>>>Host: yadayada:8081
>>>>
>>>>
>>>>bind to 192.168.0.254:80
>>>>GET http://blahblah:8082/some/stuff HTTP/1.1
>>>>Host: blahblah:8082
>>>>
>>>>HttpClient is perfectly capable of generating such requests if
>>>>configured properly. There is no need for a 'virtual' port at all
>>>>
>>>>Oleg
>>>>
>>>>
>>>>
>>>>
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