Reverse Proxy in web dispatcher

Any statistic on which product is better / qualifies better to be used as a reverse proxy.. (& wherein generic (forward) proxy services can be disabled)
Web Dispatcher
Apache
Microsoft IIS
Any other product ?
Thanks,

Thanks !!!
> URL filtering: the Web Dispatcher 7.2 supports more than one SAP backend, but you should take a look into the confguration page at SAP Help to find out if it matches your future scenario.
I am looking for WD based on 7.3 for both the roles (Reverse proxy and load balancing). But I'll check if there is anything for me to be concerned about...
> looking at your scenario, you'll have at least 1 reverse proxy in your DMZ and the Web Dispatcher will be an additional reverse proxy (for internal and/or external access).
>
> The Web Dispatcher will be connected to the message server of the portal, so when a server/node goes down, the web dispatcher will be notified. That's a vantage over another reverse proxy.
Yes, we have one server reserved for reverse proxy software and another for load balancing (WD).. These two roles need to be on separate servers as per logistics requirement... So, is this what you are talking about..
User <> WD as reverse proxy on server1 <> WD for load balancing server2 <--> EP Message Server.

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Installing reverse proxy and web dispatcher

I have come across a requirement for configuration of Reverse proxy & web dispatcher... to be installed on separate servers.
Can you help me know if SAP Web Dispatcher can run as a standalone component or will I have to install NW and then, install the SAR file. If we need NW, should I go for AS ABAP / JAVA... I believe it would be ABAP as we are using SAR file and not an SCA. Although, I wonder if my Web Dispatcher needs a database as I dont see any functional use of the database ?
How about reverse proxy.. Would it be good to go with IIS or with Apache.. Any other alternatives that you know of ?
I have been using Windows 2008 server & DB2 UDB.
Thanks,

Hi,
Please see the link below about the reverse proxy..
https://cw.sdn.sap.com/cw/docs/DOC-115672
For 'Dispatcher run as a standalone component' see the link below..
http://help.sap.com/saphelp_nwmobile71/helpdata/en/bc/0e774258449041e10000000a1550b0/content.htm
http://tleterme.developpez.com/bw/how/HowToWebDispatcher.pdf
Regards
Bhuban

Problem on Setting up a Reverse Proxy on Web Proxy Server 4.0.1

After you setup a reverse proxy using Web Proxy Server 4.0.1, if you get the following error --
Proxy denies fulfilling the request
Your client is not allowed to access the requested object.You probably forget to add a regular mapping from: / to: http://http.site.com/. The information provided in 4.0.1 Administration guide is misleading. You will have to add it NOW manually. (Note: in 3.6 it will be added automaticly)
You will have to do the following step manually, what provided in the manual is misleading --
Sun Java� System Web Proxy Server 4 .0.1 Administration Guide 2005Q4
Chapter 14 Using a Reverse Proxy
"Setting up a Reverse Proxy"
5. To make the change, click OK.
Once you click the OK button, the proxy server adds one or more additional
mappings. To see the mappings, click the link called View/Edit Mappings.
Additional mappings would be in the following format:
from: /
to: http://http.site.com/

thanks, will verify and update the docs.
rahul.

Sun Web server 6.1 SP9 Reverse proxy - Changing Web Server Context

I am trying to configure a Reverse Proxy such that it can change the context of the requested URL.
My SOWS reverse proxy plug-in is running on server server1.sample.com and the destination server is running on server2.sample.com. The use case, the incoming URL is [|http://server1.sample.com/dummy1/]...... and I need to map this to {color:#0000ff}http://server2.sample.com/*dummy2*/.....;{color} It looks like the reverse proxy only maps to a server level but disregards the context. The reason I say that, in the server 2 logs I see - .... trying to GET /dummy1....; I needed the call to look for dummy2 context. Can this be done?

well, web server uri processing does not understand web application level context (in terms of java web applications). however, if you would like to map all uri's ending with /dummy1 to go to /dummy2, then you can easily do this with web server 7 regular express processing
http://blogs.sun.com/elving/entry/mass_virtual_hosting_in_7
http://docs.sun.com/app/docs/doc/820-6599/gdaer?a=view
besides web server 7 includes a very tightly integrated reverse proxy unlike 6.1 where you need reverse proxy as a separate plugin. so, you might want to check out if ws7 can serve your needs
- sriram

Reverse proxy for web application

Hi,
The users of our a enterprise Java based web application must access a third web application through simple HTML links and then navigate in the target application.
But for security reasons and constraints the direct exchange between the browers of users and server of the other web application is not allowed.
Our web application must retrieve the web page from the other application and must return it to the users's browser. Is there a convenient way to implement this requirement in J2EE ? In this case our web application must play the role of a simple reverse proxy, must request a target JSP page from other application and process it to rewrite the URLs contained in the HTML page, then send the response to user's web browser.
Has somebedoy already done such a technical requirement ? Is there a library to implement easily this use case ?
Thansk a lot
Regards

Just use Apache HTTPD 2.4 with mod_proxy and mod_proxy_html. No need to do it 'within J2EE'.

Reverse proxy and Web Dynpro

Hello everybody,
We have a portal with some web dynpro iviews in it and we want to use a reverse proxy to block direct access to the web dynpro's. The problem we encounter is that we can not block the web dynpro URL's because then they also do not work in the portal. This is not acceptable for us.
Has anyone encountered this problem or knows a solution?
Thanks.
Best Regards,
Christohpe

Hi,
does this help? http://help.sap.com/saphelp_nw2004s/helpdata/en/59/31ae42e0fac911e10000000a1550b0/frameset.htm
Regards, Heidi

Webserver or Web Dispatcher

Hi,
My customer is implementing EDI Interfaces in PI (using Seeburger).
In this regard, one of the requirement is to configure the certificates and the private/public keys thereon for secured communication.
The PI domain is within the firewall. The customer landscape already has a Web Server (IIS) in place which is open to the outside network. They do not have a SAP Web Dispatcher. The customer wants to know whether the web server will perform the role of web dispatcher.
Please provide your suggestions and best practice.
Appreciate your help.
Thanks.
Krishnan

Hi,
>The customer wants to know whether the web server will perform the role of web dispatcher
Strange question ! Does it mean that you and your customer don't know what are the capabilities of IIS and what you want to do with it ?
For security reasons, you need at least a reverse proxy for incoming access and a proxy for outgoing access.
The reverse proxy can be for example, Apache, IIS, the SAP web dispatcher.
For the same need : B2B access to PI from and to the internet, I have setup this architecure :
Incoming :
Internet --> Apache reverse proxy --> SAP Web dispatcher --> PI
Outgoing
PI --> Apache forward proxy --> Internet
Regards,
Olivier

Webdispatcher with reverse proxy

Hi Experts,
We need to deploy reverse proxy and web dispatcher. This is for a relatively budget savvy customer so cost is big issue. My question is :-
1) Can we deploy reverse proxy & webdispatcher on the same server ? (without using VMware). Probably we will use two Linux operating system.
2) Should we plan for failover on Webdispatcher ? Or running Webdispatcher without failover may not be that big issue.
Can you guys please share your thoughts on these two issues ? Urgently require your feedback on this.
Regards,
TB

Hi,
We need to deploy reverse proxy and web dispatcher.
The web dispatcher IS a reverse proxy. What do you mean ? I think you did not perfectly understand the need...
1) Can we deploy reverse proxy & webdispatcher on the same server ?
Yes, but it does not make sense to me until you have a very unusual requirement.
Should we plan for failover on Webdispatcher ?
If you need High availability, yes. You're the only one to know if you need it...
Regards,
Olivier

Apache Reverse Proxy with Abap Web query

Hi to all
We are trying to configure apache 2 to work as a reverse proxy with web abap Netweaver installation.
From inside the network the web query is fine.
Running the query with the reverse proxy we have only the html code in the browser. All the scripts and css are not present.
We checked some messages inside the forum and we have tried a lot of stuff without success.
We use always linux (Fedora, Ubuntu with xampp or apache only) plus the html module or the publisher from http://apache.webthing.com.
Our installation is like this the reverse proxy in the dmz and the netweaver to the inside off coarse, and we don't have the same domain name, i don't know if this is important.
Any help/idea is valuable.
Thank you
Yiannis

Hi Olivier
I have seen your solution in other messages but i didn't try it because i was trying to work with the html_proxy module.
I read the documents you gave me plus some apache tutorials on the rewrite rule.
In any case i have my installation working now.
I did some extra changes in my config so now the rules are like that
ProxyVia On
ProxyBadHeader IsError
ProxyRequests Off
ProxyPreserveHost On
ProxyPass /sap http://192.168.1.59:8001/sap
ProxyPassReverse /sap http://192.168.1.59:8001/sap
RewriteEngine On
RewriteRule ^/(sap\(.*) http://192.168.1.59:8001/$1 [P,L]
Thanks again for your help
Yiannis

Automatically authenticate reverse proxy on ML web server

My Mini server is running 10.8.2. I've set apache up to reverse proxy several web cameras and I then force authentication to the domain via a group. However the cameras have their own authentication that I can't circumvent. Is there a way to authenticate to the cameras via apache's reverse proxy? Here is my current apache config....
ProxyRequests off
ProxyPass /camera1/ http://192.168.0.30/
ProxyPass /camera2/ http://192.168.0.32/
ProxyPass /camera3/ http://192.168.0.34/
ProxyPass /camera4/ http://192.168.0.36/
ProxyPassReverse /camera1 http://192.168.0.30
ProxyPassReverse /camera2 http://192.168.0.32
ProxyPassReverse /camera3 http://192.168.0.34
ProxyPassReverse /camera4 http://192.168.0.36

well, technology preview is what the name says .. i am surprised that u decided to stick with a technology preview release all these days.. in any case, there should not have any feature change between technology preview build and U4. but , there has been lot of bug fixes - so, unless we know the exact problem - we can't easily narrow down the change between tp3 build with U4 and find out how it is affecting u.
here is a related article on how to use chunked encoding within web server 7
http://developers.sun.com/webtier/reference/techart/chunked_req.html
now, to help you more appropriately, you need to provide us with errors (probably with log level set to finest within server.xml) and let us know with the error reported by web server when it is unable to send those requests to back end tomcat
you can set log level to finest by running the following command
/sun/webserver7/bin/wadm set-config-prop -user=admin --config=<hostname> log-level=finest
/sun/webserver7/bin/wadm deploy-config --user=admin <hostname>
http://docs.sun.com/app/docs/doc/820-4842/set-config-prop-1?a=view
(once you have identified the problem, you might want to set log level to info as setting to finest will cause your logs to grow humongous and also hurt performance
thanks
sriram

Reverse Proxy installatio on Web Server

Hi,
Can anyone help me to install a reverse proxy on a Web Server and configure it. Is there any documentation and where and how I can download the reverse proxy for Web Server.
Thanks in Advance.

Reverse proxy functionality is inbuit in Sun Java System Web Server 7.0.
Official WS 7.0 docs are at :
http://docs.sun.com/app/docs/coll/1308.3
Some blogs
http://blogs.sun.com/meena/entry/configuring_reverse_proxy_in_sun
http://blogs.sun.com/meena/entry/configuring_reverse_proxy_in_web

Iview capable of performing reverse proxy for application integration.

Is there a iview in EP capable of reverse proxying a web application. We are attempting to setup
our production landscape. We can of course use apache to reverse proxy applications hidden behind our dmz by punching a bunch of holes through our firewall. This is not something we wish wish to do as it totally circumvents the safety imposed by our firewalls and dmz. Not having this capability causes all sorts of difficulties with application integration, cross domain scripting issues as well as administrative burden by having to maintain, secure and expose these internally hosted applications.
If this functionality does not exist in out of the box EP, does anyone know a third
party that offers this?
Thanks
Cliff Baeseman

Cliff,
I am not sure I understood your question correctly.
EP is an application running on NetWeaver Application Server. This AS has a component called as Web dispatcher which works like a reverse proxy but isn't meant to proxy applications running on a different server other than NetWeaver AS.
Where is your web application deployed?
More info needed.
Regards,
Kiran

Using reverse proxy for load balancing

Hello,
i have succesfully configured a reverse proxy ( Sun Web Server 7 ) to balance load between two application servers ( Sun Application Server 9.1), however i do not want randon assignment of requests using a round robin algorithm ( default option in Sun Web Server 7) but rather i want to apply a 80/20 rule so that one application server will receive 80% of the requests and the other will receive 20%.
Is there a way of performarming such a task.
your help is really appreciated.
thank you

thank you for the reply,
actually i tried it yesterday and it seems to work.
in my reverse proxy settings i added one server two times and the other once and 66% of the requests were forwarded to the first server.
now i have enabled the scenario that you are mentioning above and i so far requests seem to be proceced using the 80% 20% scenario.

Setup Reverse proxy

Hi,
I want to setup Sun one web server 6.1 as Reverse proxy over one of the App on other server.
client pc > <Intranet site> > Proxy to another Intranet site with SSL
does anyone has any working config which could help setting this up on Windows ?
Thanks in advanced

[Here is a blog about how to configure reverse proxy on Web Server 7.0|http://blogs.sun.com/meena/entry/configuring_reverse_proxy_in_sun]

Reverse Proxy - Apache vs SAP Web Dispatcher

Hi,
my config consists in a portal (EP7.0 - DB/CI + AS) and an ECC system (ECC 6.0 - DB/CI + AS).
Web developments are based on Abap Web Dynpro and are also located on ECC.
To ensure load balancing there are 2 web dispatchers : one on EP DB/CI, one on ECC DB/CI.
Those 2 systems are located in intranet. Intranet access are realized via http.
Moreover I need to open this solution to internet. I need a component to filter access in DMZ and ensure reverse proxy + https functions.
Technical target chain links are depicted below.
internet access : browser (https) -
> (https) reverse proxy in DMZ (http) -
> IS (Portal/ECC)
intranet access : browser (http) -
> IS (portal/ECC)
At the moment two application gateway solutions have been identified :
Apache (MOD_PROXY + MOD_HTTPS) - My configuration is based on Linux
SAP Web Dispatcher ("cascading" implementation as described in OSS note 740234)
I'm looking for PROs and CONs of those 2 solutions and I'm also seeking for the impact of ensuring https encryption/decryption at the application gateway level ("a priori" this usage is not transparent in term of server sizing - CPU/memory, do I require to implement an SSL accelerator ?).
Regards.
Frederic.

Hi,
PRO Webdispatcher:
- Supports SAP Java + ABAP
- Loadbalancing of SAP applications (stateful)
- Supports load balancing (saplb_* cookie)
- Free of costs
- easy to set up (up & running in 2 minutes)
- Supports HA solutions out-of-the-box (process HA)
- Filter + Rules to modify the requests
CONS Webdispatcher
- not a full reverse proxy
- Limited functionality
- one more server/solution (normaly, a company already does have a reverse proxy solution in place)
- limited user base (only SAP customers)
PRO Apache
- free
- widly in use
- full reverse proxy
- allows more complex filtering / rewriting
- can be used for more web solutions, reuse of existing apache reverse proxy
CONS Apache
- does not support SAP load balancing (connection to the message server port for load distribution)
- can be more complex to set up
- SAP specific technology / problems are more harder to fix (ABAP, Stateful connections, sap_lb*)
Short: both will server well as a reverse proxy.
Rule of thumb: If you go for Apache or Web Dispatcher should mainly depend on you current IT landscape. If you already do have an apache in use, use Apache. You already have the people / knowledge, try to foster it .
If you start from scratch and have SAP Logon Groups or many WebDynpro ABAP applications, go for the Web Dispatcher.
br,
Tobias

Reverse Proxy in web dispatcher

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