You could write a servlet to do the work like this:
- Handle the incoming request
- Issue an HTTP request to the desired form/resource, create the
authentication context, etc.
- Parse the HTTP response headers for the response codes
- I use the plural "headers" because when you request a page like the
Home Page, you will get back many HTTP responses for things like css, js,
etc.
- You will want to look at the response code for the original request,
e.g., /Home+Page/
- Return the desired HTTP response code based on the response above
This varies from the redirect approach, which will change the response to a
301 or 302. Servlet is probably the more appropriate technology for this,
versus a jsp, though you can probably get either to work.
On Wed, Dec 8, 2010 at 1:26 PM, LJ LongWing <[email protected]> wrote:
> **
>
> That’s the problem, I can’t have the load balancer ‘log on’, they need a
> URL that returns a 200 or 500 period. So I am looking for some automated
> way to log on automatically on the back end and verify that everything is
> functional, if it is, return a 200, if not, 500…and a redirect changes it
> from a 200 so it won’t work
>
>
>
> *From:* Action Request System discussion list(ARSList) [mailto:
> [email protected]] *On Behalf Of *Axton
> *Sent:* Wednesday, December 08, 2010 11:47 AM
>
> *To:* [email protected]
> *Subject:* Re: JSP to monitor functionality
>
>
>
> ** Why not have the load balancer load the home page, authenticate, and
> check the response code. If 200, then status is ok, if 500 series, then
> fault the node. I assume that when the error below occurs in the mid-tier
> logs, you are getting 500 responses in the browser.
>
>
>
> The response code is really easy to pick out of the http headers and it is
> something that every web server will return will every http request.
>
> On Wed, Dec 8, 2010 at 11:15 AM, LJ LongWing <[email protected]>
> wrote:
>
> **
>
> I have recently been having issues where the Tomcat is ‘functional’ from a
> Tomcat perspective, but you can’t log onto the app server, getting the
> following error. What I’m trying to do is write a jsp that will see if a
> URL ‘returns a value’…specifically I’m planning on using a login URL to get
> to the home page with ID and PW pre-configured on the URL…..if that URL
> loads fine, I need to have the JSP page return a 200, if not, something
> else. This is for a load balancer that can’t currently tell if your server
> is online or not.
>
>
>
> HTTP Status 500 -
>
>
>
> type Exception report
>
>
>
> message
>
>
>
> description The server encountered an internal error () that prevented it
> from fulfilling this request.
>
>
>
> exception
>
>
>
> java.lang.ArrayIndexOutOfBoundsException
>
> java.lang.System.arraycopy(Native Method)
>
>
> com.bmc.arsys.arrpc.rpcext.ArXdrTcpEncodingStream.getEncodedBuffer(Unknown
> Source)
>
> com.bmc.arsys.arrpc.rpcext.ArXdrTcpEncodingStream.endEncoding(Unknown
> Source)
>
> com.bmc.thirdparty.org.acplt.oncrpc.OncRpcTcpClient.call(Unknown
> Source)
>
> com.bmc.arsys.api.arxdrenc.b.call(Unknown Source)
>
> com.bmc.arsys.api.session.c.a(Unknown Source)
>
> com.bmc.arsys.api.ProxyJRpcBase.a(Unknown Source)
>
> com.bmc.arsys.api.ProxyJRpcBase.arCall(Unknown Source)
>
> com.bmc.arsys.api.ProxyJRpc.ARVerifyUser(Unknown Source)
>
> com.bmc.arsys.api.ARServerUser.verifyUser(Unknown Source)
>
> com.bmc.arsys.api.ARServerUser.login(Unknown Source)
>
> com.remedy.arsys.session.LoginServlet.authenticate(Unknown Source)
>
> com.remedy.arsys.session.LoginServlet.doLogin(Unknown Source)
>
> com.remedy.arsys.session.LoginServlet.doThePost(Unknown Source)
>
> com.remedy.arsys.session.LoginServlet.doRequest(Unknown Source)
>
> com.remedy.arsys.stubs.GoatHttpServlet.postInternal(Unknown Source)
>
> com.remedy.arsys.stubs.GoatHttpServlet.doPost(Unknown Source)
>
> javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
>
> javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
>
> note The full stack trace of the root cause is available in the Apache
> Tomcat/5.5.28 logs.
>
>
>
>
>
> *From:* Action Request System discussion list(ARSList) [mailto:
> [email protected]] *On Behalf Of *Axton
> *Sent:* Wednesday, December 08, 2010 10:02 AM
> *To:* [email protected]
> *Subject:* Re: JSP to monitor functionality
>
>
>
> ** Hit the mid-tier configuration page; if it loads, then the container/jvm
> are working. If you want to go beyond that, create a jsp that performs the
> desired checks and returns the output in a format that you can parse, like
> xml.
>
> On Wed, Dec 8, 2010 at 10:45 AM, LJ LongWing <[email protected]>
> wrote:
>
> **
>
> I have an urgent need to be able see if our server is online through JSP.
> Suggestions?
>
> _attend WWRUG11 www.wwrug.com ARSlist: "Where the Answers Are"_
>
>
> _attend WWRUG11 www.wwrug.com ARSlist: "Where the Answers Are"_
>
> _attend WWRUG11 www.wwrug.com ARSlist: "Where the Answers Are"_
>
>
>
> _attend WWRUG11 www.wwrug.com ARSlist: "Where the Answers Are"_
> _attend WWRUG11 www.wwrug.com ARSlist: "Where the Answers Are"_
>
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