Detect server node processing a http request

Is there any way to detect which server node is answering a http request? For debug purposes I would like to add the cluster element to the output of a jsp. Maybe it is also possible to force a jsp being processed by a given node?
Thanks in advance for your answers!
Best regards,
Frank

Hi Violeta,
Thanks for your answer! This has been very helpful indeed.
However, I´m still a bit puzzled. Replacing the saplb cookie forces the load balancer to use the given server, but the JSESSIONID does not change. Looking at the application data I know that I´m talking to a different server, but I still don´t seem to have a way to tell which server ansered - except my expectation that the saplb cookie might have been taken into account by the server.
Isn´t there a more sophisticated way to access this kind of information? Escpecially, getting a list of all available servers would be great, as this would allow to choose the server having a look at.
Best regards,
Frank

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[EXCEPTION] java.lang.VerifyError: Bad return type
Exception Details:
Location: com/sap/wec/tc/core/runtime/jsf/resource/WecExternalContextFactory.getExternalContext(Ljava/lang/Object;Ljava/lang/Object;Ljava/lang/Object;)Ljavax/faces/context/ExternalContext; @17: areturn
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Current Frame:
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Bytecode:
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    0000010: 06b0
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    at java.lang.Class.privateGetDeclaredConstructors(Class.java:2446)
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Regards
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Thanks for promt response.
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Hi Ivan!
The fact the this code worked fine yesterday or is working fine in Dev but not in another system proves nothing. On the contrary, the stack trace confirms that the problem stems from your custom code com.vatti.mes.common.web.BaseServlet.doError(BaseServlet.java:61). The obvious thing is that the method here is called "doError" that likely means you either face some error there or intentionally generate error message. After that the system tries to log the error message but it looks as if com.sap.me.frame.Utils.getStackTrace method gets null as an input parameter e. How does it get triggered and what is passed into - this is a question to your developers.
Regards,
Sergiy

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#2.0 #2010 08 20 15:02:47:398#+0200#Info#/Applications/DTR/Lifecycle#
lifecycle.startApplicationInitialisation#BC-CTS-DTR-SRV#sap.com/tcdtrenterpriseapp#005056BA56AE050000000000000010D8#1694250000000004#sap.com/tcdtrenter
priseapp#com.tssap.dtr.server.servlet.WebdavServlet#Guest#0##F30581C3AC5A11DFCAED00000019DA2A#f30581c3ac5
a11dfcaed00000019da2a#f30581c3ac5a11dfcaed00000019da2a#0#Thread[HTTP Worker [@1902689675],5,Dedicated_Application_Thread]#Plain#com.tssap.dtr.server.deltav.resources.log_messages#
Starting initialisation of DTR application.#
#2.0 #2010 08 20 15:02:47:405#+0200#Fatal#/Applications/DTR/Lifecycle#
com.sap.DI.dtr.090009#BC-CTS-DTR-SRV#sap.com/tcdtrenterpriseapp#005056BA56AE050000000001000010D8#1694250000000004#sap.com/tcdtrente
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a11dfcaed00000019da2a#f30581c3ac5a11dfcaed00000019da2a#0#Thread[HTTP Worker [@1902689675],5,Dedicated_Application_Thread]#Plain#com.tssap.dtr.server.deltav.resources.log_messages#
Initialisation of DTR application failed. Please refer to SAP note 774339 for more details on how to analyze the error condition.#
And this is the message from the Default Trace: (not all, that didn't fit in this thread)
#2.0 #2010 08 20 15:13:49:744#+0200#Error#com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl#
com.sap.ASJ.web.000137#BC-CTS-DTR-SRV#sap.com/tcdtrenterpriseapp#005056BA56AE05D600000002000010D8#1694250000000004#sap.com/tcdtrent
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A2A#7db05704ac5c11dfa28500000019da2a#7db05704ac5c11dfa28500000019da2a#0#Thread[HTTP Worker [@236433360],5,Dedicated_Application_Thread]#Plain##
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Hello Julian
This is a known problem.
Cause
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Resolution
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1. open Visual Administrator
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Thanks
Kenny.

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Greetings,
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Hi Anuradha,
Please use something like:
http://<Server>:<Port Number>/irj/servlet/prt/portal/prtroot/com.sap.portal.navigation.portallauncher.default;sapj2ee_*=<NodeID>.
You can use
java_scriptj<colon>alertOpenparentesisdocument<dot>cookiecloseparentesis
to find out if you connected to the proper node. Note the sapj2ee_* parameter is optional so if the value provided is not correct it will connect you to one of the available nodes. Remove the underscore from java_script.
Replace:
java_script with javascript
<colon> with :
Openparentesis with (
Closeparentesis with )
SCN would not let me post the symbols
Best regards,
Duncan
Edited by: Duncan Speidel on Nov 22, 2011 11:20 PM

Application Web Service Control Manager detected AWEBSVC is not responding to HTTP requests. The http status code and text is 400, Bad Request.

Hi All,
I am seeing the following error for SMS_AWEBSVC_CONTROL_MANAGER component with Message ID: 8100
Application Web Service Control Manager detected AWEBSVC is not responding to HTTP requests. The http status code and text is 400, Bad Request.
awebsctl.log file has below errors:
Call to HttpSendRequestSync failed for port 80 with status code 400, text: Bad Request
SMS_AWEBSVC_CONTROL_MANAGER 12/22/2014 3:37:55 PM
13920 (0x3660)
AWEBSVCs http check returned hr=0, bFailed=1
SMS_AWEBSVC_CONTROL_MANAGER 12/22/2014 3:37:55 PM
13920 (0x3660)
AWEBSVC's previous status was 1 (0 = Online, 1 = Failed, 4 = Undefined)
SMS_AWEBSVC_CONTROL_MANAGER 12/22/2014 3:37:55 PM
13920 (0x3660)
Health check request failed, status code is 400, 'Bad Request'.
SMS_AWEBSVC_CONTROL_MANAGER 12/22/2014 3:37:55 PM
13920 (0x3660)
Management point and Application Catalog Website Point are installed on the same Server where I am seeing the error for Application Catalog Web Service Point role. Management Point and Application Catalog Website Point are functioning properly. Application
Catalog Website is working.
Thanks & Regards, Kedar

Hi Jason,
Application Catalog Web Service Point and Application Catalog Website Point; both are installed as per below configuration on same Server:
IIS Website: Default Web Site
Port Number: 80
with default value for Web Application Name configured.
For SMS_AWEBSVC_CONTROL_MANAGER component, I am getting below error in Component Status:
Application Web Service Control Manager detected AWEBSVC is not responding to HTTP requests. The http status code and text is 400, Bad Request.
Possible cause: Internet Information Services (IIS) isn't configured to listen on the ports over which AWEBSVC is configured to communicate.
Solution: Verify that the designated Web Site is configured to use the same ports which AWEBSVC is configured to use.
Possible cause: The designated Web Site is disabled in IIS.
Solution: Verify that the designated Web Site is enabled, and functioning properly.
For more information, refer to Microsoft Knowledge Base.
And awebsctl.log has the below error lines:
Call to HttpSendRequestSync failed for port 80 with status code 400, text: Bad Request
SMS_AWEBSVC_CONTROL_MANAGER
12/23/2014 11:04:36 AM 16388 (0x4004)
AWEBSVCs http check returned hr=0, bFailed=1
SMS_AWEBSVC_CONTROL_MANAGER
12/23/2014 11:04:36 AM 16388 (0x4004)
AWEBSVC's previous status was 1 (0 = Online, 1 = Failed, 4 = Undefined)
SMS_AWEBSVC_CONTROL_MANAGER
12/23/2014 11:04:36 AM 16388 (0x4004)
Health check request failed, status code is 400, 'Bad Request'.
SMS_AWEBSVC_CONTROL_MANAGER
12/23/2014 11:04:36 AM 16388 (0x4004)
STATMSG: ID=8100
What should I check from IIS side?
Application Catalog Website is functioning properly.
Thanks & regards,
Kedar
Thanks & Regards, Kedar

Re: (forte-users) HTTP request through proxy server

Daniel -
No, it does not. ;)
How do you say to HTTPRequest to go through proxy?
Thanks,
Taras
Daniel Nguyen wrote:
>
Hi,
It works very well. I have experienced this model for a distant Forte client
calling a Forte Server service Object for instance without any environment
and without TCP access (passing through firewall for instance).
It has also worked very well to make an injectot to improve Web Enterprise
and IIS using the SendRequest from HTTPAccess.
Hope this helps,
Daniel Nguyen
Freelance Forte Consultant
http://perso.club-internet.fr/dnguyen/
Taras Katkov a écrit:
HTTP request through proxy server using forte HTTP library?
Any experience?
Thanks,
Taras
For the archives, go to: http://lists.xpedior.com/forte-users and use
the login: forte and the password: archive. To unsubscribe, send in a new
email the word: 'Unsubscribe' to: forte-users-requestlists.xpedior.com--
For the archives, go to: http://lists.xpedior.com/forte-users and use
the login: forte and the password: archive. To unsubscribe, send in a new
email the word: 'Unsubscribe' to: forte-users-requestlists.xpedior.com

You can also use the HTTP-DC project.... You don't
need Web Enterprise for this. From what I can tell,
this is available in L.x on....
There is api documentation in M.2 (with scant
examples.)
There's a special process to put the project in your
repository (it isn't installed in the repository in
the standard install,) the documentation in M.2
(probably in M.0 too, AFAIK) that tells you how to do
this (look for HTTP-DC in the online help.)
I haven't done much with it yet, I've just installed
it. If anybody out there has examples, that'd be
great. I'll try to contribute more the moment I get a
chance to explore it....
Christopher Fury
BellSouth Communications Systems
--- Daniel Nguyen <dnguyenclub-internet.fr> wrote:
Hi,
If you have Web Enterprise, you can user
HttpAccess.SendRequest().
Hope this helps,
Daniel Nguyen
Freelance Forte Consultant
Amin, Kamran a écrit:
Is there any way to make a HTTP request from TOOLto another HTTP Service?
thanks in advance.
For the archives, go to:
http://lists.xpedior.com/forte-users and use
the login: forte and the password: archive. Tounsubscribe, send in a new
email the word: 'Unsubscribe' to:forte-users-requestlists.xpedior.com
For the archives, go to:
http://lists.xpedior.com/forte-users and use
the login: forte and the password: archive. To
unsubscribe, send in a new
email the word: 'Unsubscribe' to:
forte-users-requestlists.xpedior.com
Kick off your party with Yahoo! Invites.
http://invites.yahoo.com/

How to Implement HTTP Request Status Code Processing

I actually have two questions. First, I wondering how to add multiple status code processing to an http request. Secondly, I was wondering how to go about using alternate http requests to different servers in case the primary server is down. What kind of parameter would the program use to determine that the server is unavailable and switch to another server??
Currently, the program I've written calls an rdf server (http://www.rdfabout.com/sparql) using a sparql query,
the server returns an xml string, the program parses it, and calculates numbers
from the string. The program works, but the problem is that the server is down occasionally.
When the server is down, we need to add calls to another server to
increase reliability. So, the next task is to call this server:
http://www.melissadata.com/lookups/ZipDemo2000.asp
I need to do exactly the same things I did with the rdf server. The
difference will be constructing a request and a bit different parsing of
the response.
current SPARQL query is defined as follows:
PREFIX dc: <http://purl.org/dc/elements/1.1/>
PREFIX census: <http://www.rdfabout.com/rdf/schema/census/>
PREFIX census1: <tag:govshare.info,2005:rdf/census/details/100pct/>
DESCRIBE ?table WHERE {
<http://www.rdfabout.com/rdf/usgov/geo/census/zcta/90292> census:details
?details .
?details census1:totalPopulation ?table .
?table dc:title "SEX BY AGE (P012001)" .
}current HTTP Request is defined as follows:
import java.net.*;
import java.net.URL;
import java.net.URLConnection;
import java.io.*;
import java.io.DataOutputStream;
import java.io.BufferedReader;
import java.io.StringReader;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.Arrays;
public class MyConnection
     static Scanner sc = new Scanner(System.in);//allows user to input zipcode
    public static void main(String[] args) throws Exception
         int zip;//zipcode is declared as integer format
        //User defines zip through input
        //proceed to put SPARQL query into string, which is then used to call the server
        String requestPart1 =
        "query=PREFIX+dc%3A++%3Chttp%3A%2F%2Fpurl.org%2Fdc%2Felements%2F1.1%2F%3E+%0D%0APREFIX+census%3A+%3Chttp%3A%2F%2Fwww.rdfabout.com%2Frdf%2Fschema%2Fcensus%2F%3E+%0D%0APREFIX+census1%3A+%3Ctag%3Agovshare.info%2C2005%3Ardf%2Fcensus%2Fdetails%2F100pct%2F%3E+%0D%0A%0D%0ADESCRIBE+%3Ftable+WHERE+%7B+%0D%0A+%3Chttp%3A%2F%2Fwww.rdfabout.com%2Frdf%2Fusgov%2Fgeo%2Fcensus%2Fzcta%2F";
        String requestPart2 = "" + zip; // zipcode is transformed from int to string format and plugged into SPARQL query here
        String requestPart3 =
        "%3E+census%3Adetails+%3Fdetails+.+%0D%0A+%3Fdetails+census1%3AtotalPopulation+%3Ftable+.+%0D%0A+%3Ftable+dc%3Atitle+%22SEX+BY+AGE+%28P012001%29%22+.+%0D%0A%7D%0D%0A&outputMimeType=text%2Fxml";
        String response = "";
        URL url = new URL("http://www.rdfabout.com/sparql");//designates server to connect to
        URLConnection conn = url.openConnection();//opens connection to server
        // Set connection parameters.
        conn.setDoInput (true);
        conn.setDoOutput (true);
        conn.setUseCaches (false);
        // Make server believe we are form data
        conn.setRequestProperty("Content-Type","application/x-www-form-urlencoded");
        DataOutputStream out = new DataOutputStream (conn.getOutputStream ());
        // Write out the bytes of the content string to the stream.
        out.writeBytes(requestPart1 + requestPart2 + requestPart3);
        out.flush ();
        out.close ();
        // Read response from the input stream.
        BufferedReader in = new BufferedReader (new InputStreamReader(conn.getInputStream ()));
        String temp;
        while ((temp = in.readLine()) != null)
             response += temp + "\n";
        temp = null;
        in.close ();
        //parsing stuff is taken care of after here
}What remains now is to:
1) add status code processing: notify if the server is not available, ect.
2) add ability to connect to additional server if primary server is down.
I'm thinking an if/else statement, which I've tried a few different ways,
but I don't quite know how to implement that...Also trying to add the
status code processing/error handling, but I'm not sure how to do that
for multiple/different errors, such as 404, 503, 504, ect.. try/catch statements?
So yeah, just been scratching my head on this trying to figure out how to work it..
If you can help me out on this, I've been going nuts trying to figure this out...

I think your issue comes form the fact that you are not casting URLConnection to HttpURLConnection.
Doing the cast would allow you to use getResponseCode() - among other methods - and test for a response different than 200.
Read: [http://mindprod.com/jgloss/urlconnection.html|http://mindprod.com/jgloss/urlconnection.html]

Weblogic server to server loadbalancing for Http requests

Hi
we have a domain consisting of 3 clusters (weblogic 9.2 mp3)
FE--> has a monolithic app using both JSPs ejb
JMS--> Provides Messgaing services to FE and hosts dsitributed JMS destinations
security --> provides security services to FE (This is a new cluster we are adding to the existing domain)
Our clients interact with FE through a h/w load balancer and IIS hosting IIS plugin.
FE interacts with JMS using comma sperated url list
Now , new requirement is for The FE cluster to send http requests to the security cluster
How do I load balance these requests and have failover in case one node in the security cluster goes down?
Traditionally these methods are used for client to server load balancing but our use case is different so I am wondering how to accomplish this.
Options I came up with are
using a HttpCluster servlet (but you hav eto run a separate weblogic instance just for that)
using another h/w load balancer in front of this security cluster
I am trying to see if there are any other options to accomplish this .Also trying to understand pros and cons and which of this is reccomended for Production environments
Appreciate any comments/feedback on this
Thanks
Best

Using HTTPClusterServlet is not recommeded to be used in Prod.
To load balance the request going to the security cluster, you can simply use a webserver infornt of the cluster.
Failover is taken care of by the Cluster itself so you dont have to worry about that....

How to intercept Http requests by writing an App Server plugin?

Hi all,
My requirement of "Application Server plugin/filter" is to intercept all Httprequests coming to an
Application Server instance (and not webserver), get the related information from the request, do whatever
i want to do and then forward the request based on the info available in the request header to any
webapplication or EAR deployed in the application server.
I do not want to implement as a Servlet filter in a webapp. which is intrusive to the webapp.
as we are aware, Servlet Filters can be attached to resources in a Web application and are configured in the
web.xml file.
I have tried out my requirements in Tomcat as follows, it works:
In Tomcat, Valves are attached to a Tomcat container and are configured using a <Valve> element in the
server.xml file.
We have modified RequestDumperValve Filter ( source available) class extending Valve to intercept Http
requests.
I perform whatever i want to do in this custom Filter and then able to forward to the next valve in the valve
chain of Tomcat container. I have Configured this valve in server.xml and it works fine.
My queries are:
1. Can i do it the same thing in WebLogic application server or other IBM Websphere application server ?
2. Do the commercial appservers expose their APIs ( e.g. like Valve or Filter in Tomcat ) such that i can
implement an application server plugin ?
i.e. Are there any such Filter classes available which will intercept the Http request processing pipleine
in application server ( precisely, its web container )
If so, can you pls provide pointers for WebLogic application server and IBM Webpshere application server
3. Is this against J2ee specs ?
Appreciate if you can provide me any clues, tips, solutions, pointers regarding this problem.
thanks and regards
rajesh

Try proxyHandler property and implement a custom ProxyHandler.
ex:
<property name="authPassthroughEnabled" value="true"/>
<property name="proxyHandler" value="com.sun.enterprise.web.ProxyHandlerImpl"/>
null

Detect server node processing a http request

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