Re: 500 Error when trying to call a program with a service

[Scott Klement <web400@xxxxxxxxxxxxxxxx>]

Vicki,

You should not change the job description of IBM jobs such as QZHBHTTP. 
This can result in "unpredictable results" down the road.

For the IBM HTTP Server (powered by Apache), there's really two ways to 
deal with library lists:

1) Set QIBM_CGI_LIBRARY_LIST in your httpd.conf file. You can have 
several different library lists this way by setting this differently in 
different <Directory>, <Location>, etc containers.

Advantage: Very easy to code, HTTP server does the work for you.

Disadvantage: Although you can set up a bunch of nice library lists this 
way, anytime you need to add more or change the ones you've got, you 
have to restart the HTTP server.


2) Have the HTTP server launch a "routing" program that sets the library 
list before calling the application.

Advantage: Very versatile, you can use any logic you wish in the routing 
program to set up the library list any way that's needed. You can 
dynamically change the library list as much as you want without any need 
to stop/start the server.

Disadvantage: You have to code the routing program to make it work.  You 
also have to be careful to set the library list back to the way Apache 
had things after the call is done so that it doesn't interfere with 
future programs.

-SK


On 3/11/2016 9:47 PM, Vicki Wilson wrote:
> Click.  The light bulb finally went off on the drive home from work.
> This is actually a set of two programs.  A header and a detail.  The only service program reference is the detail program.When the header is first call and I sign-in a CGI job is established with my user and I can see that the library list has changed for that job. Then a header record is picked and the detail program is called.  Again if any library list changes are triggered they happen here.I have a jquery dialog box as a form.  The two ajax calls happen when the user tabs out of the field.
> I think the first ajax call is likely processed by my original job.  And the second is probably initiating a new job.  And the new job would not have had the library list set.
>
> Re-reading Brad's response I think he explained that.  But besides being frustrated with the problem I haven't had to pay much attention to the apache jobs.
>
> I've been doing web work regularly for a few years but just did basic stuff.  I thought I had the whole statelessness thing worked out - but clearly not.  I'm stepping up the game with lots of javascript/jquery/ajax and having fun with it.
>
> Now I'm wondering how to handle this - insight on QZHBHTTP would be helpful.  Will have to test changes on Monday.  Also wondering if the *DEFER that Charles mentioned will work.  Or...
> Thanks again Brad - your explanation was good I just needed to step away from the problem.
>
> Vicki