Need help in web dispatcher settings for redirect

[former_member186148]

Hello All!

I need to redirect users from one URL (http://webdispatch:port1/abc/efg) to another (http://host2:port2/abc/efg) but URL in browser must stay unchanged (http://webdispatch:port1/abc/efg) after redirect. As I think server should get requested URL from browser, internally redirect to URL #2 and send response of URL #2 to browser.

I've set up Web Dispatcher for redirecting by using parameter icm/HTTP/redirect_0, but now URL in browser is changing with http://host2:port2/abc/efg

icm/HTTP/redirect_0 = PREFIX=/,FOR=webdispatch:,FROM=/sap/bc/webdynpro/sap/zwd_rep,HOST=host2,PORT=port2

How I can do it?

Helpful answers will be appreciated

Regards, Lev

[Ayax]

Hello Lev,

Have you set up a permission table? Check if parameter wdisp/permission_table is in your web dispatcher instance profile.

Regards,

Ayax

[Former Member]

Good point, Ayax.

The best thing is to comment or remove wdisp/permission_table parameter for now.

This will give unrestricted access to URLs.

Once it is working, it will be time to setup restrictions.

Regards,

Slava

[Former Member]

Hi,

What you describe is not URL redirect, it is just the standard job of an HTTP reverse proxy like the SAP Web dispatcher.

You just need to connect the web dispatcher to the http port of the message server of host2.

There is non need to use icm/HTTP/redirect_0

Regards,

Olivier

[Former Member]

Salut Olivier,

You got the idea of it, but I would argue the definition a bit.

Lev described URL redirect, where user is redirected, "asked to go somewhere else", it is correct.

The issue is that in order for URL to stay the same in the web browser, he needed "URL forwarding" or "URL routing" and not URL redirect. In this case web dispatcher operates as a true reverse proxy, meaning web dispatcher presents servers to users (not the other way, hence additional word "reverse").

You got the main idea - it is not possible to keep URL intact and present different content, using

icm/HTTP/redirect_0.

Lev did not mention that host2 is an SAP host, so I suggested two solutions in my previous post:

one with message server and another with icr file.

I just want to keep terminology clear.

À Bientôt,

Slava

Edited by: Slava Plyushchikov on Nov 20, 2008 11:58 AM

[Former Member]

Lev,

This will depend on what your host2 is.

If it is a SAP J2EE engine, like EP and you need to do a load balancing, then connect you web dispatcher to host2 message server. You will get a load balancing and URL will stay webdispatch.

Use

rdisp/mshost = <host2>
ms/http_port = <HTTP message server port od host2>

If you do not need load balancing, which looks like your case, regardless of the type of host2, you can use web dispatcher as a router.

Create a file info.icr with the following context:

Version 1.0
SYS
J2EE <host2> <port2> DIA=2

Use the following parameter in pfl:

wdisp/server_info_location = <full path>/info.icr

Regards,

Slava

А если что - пиши, поможем...

[former_member186148]

Hi Slava!

Thank you for reply!

I've tried to use info.icr, but got an error.

I've added following at the end of pf:

wdisp/server_info_location = D:\usr\sap\WDC\SYS\profile\info.icr

then I've created info.cr:

Version 1.0

SYS

J2EE crmdev.oao.sng 8010 DIA=2

An error was:

403 Access denied

You do not have the permissions to access this resource

-

---

Error: -13

Version: 7000

Component: HTTP_ROUTE

Date/Time: Fri Nov 21 11:01:03 2008

Module: http_route.c

Line: 2759

Server: crmdev_WDC_30

Error Tag:

Detail: permission denied for /b2b_sng/b2b/init.do

What is going?

[Former Member]

Lev,

This error is a good sign, because it works.

You just need to finish config.

It looks like you have a wrong port number in

J2EE crmdev.oao.sng 8010 DIA=2

8010 is probably an HTTP message server port.

It would work for option 1 I gave you, but for option 2 it should be HTTP port of your SRM J2EE Engine.

What is your target destination exactly?

If it is http://crmdev.oao.sng:51000/b2b_sng/b2b/init.do

use

J2EE crmdev.oao.sng 51000 DIA=2

You got the idea:

take your target URL and use hostname and port in the icr file.

Or else use option 1 without icr file

rdisp/mshost = crmdev.oao.sng 
ms/http_port = 8010

Regards,

Slava

Edited by: Slava Plyushchikov on Nov 21, 2008 5:36 AM

Edited by: Slava Plyushchikov on Nov 21, 2008 5:55 AM

[former_member186148]

Thanks for your replies.

I've tried to comment wdisp/permission_table parameter but it had no effect. And it seems that I've made a mistake: I forgot to comment icm/HTTP/redirect_0 while tested work of icr file.

I have:

web dispatcher at webdisp_host:1090

host with ABAP+Java instance at inst_host

icm/HTTP/redirect_0 commented

use icr file:

>Version 1.0

>SYS

>J2EE crmdev.oao.sng 8010 DIA=2

At inst_host I has two apps:

/b2b_sng/ ( inst_host:50000/b2b_sng/ )

and /sap/bc/* ( inst_host:8010/sap/bc/webdynpro/* )

webdisp_host:1090/b2b_sng/ works fine.

webdisp_host:1090/sap/bc/webdynpro/* don't work:

500 Dispatching Error
Error:	-26
Version:	7000
Component:	HTTP_ROUTE
Date/Time:	Mon Dec 01 17:41:24 2008
Module:	http_route.c
Line:	3121
Server:	crmdev_WDC_30
Error Tag:	
Detail:	no valid destination server available for '!ALL' rc=13

Slava,

> 8010 is probably an HTTP message server port.

I think no since inst_host:8010/sap/bc/webdynpro/* working fine.

Parameters

> rdisp/mshost = crmdev.oao.sng

> ms/http_port = 8010

has been already added into profile, but http_port = 8101 instead 8010