Firefox扩展：LiveHttpHeaders

Firefox数目众多，功能丰富的扩展真好。今天测试联邦档案馆会议记录的搜索功能时多亏有了LiveHttpheaders才发现我的问题在于提交request时，header里没有包括jessionid这个变量，所以搜索的结果分页问题不能解决。

另外在Tomcat的邮件列表中名为Christ写了一段很好的关于在搜索中使用jsessionid的问题：

> Is there anyway to create JSessionIDs per window rather than per browser?
> I am having the problem of when you open multiple tabs within
> a browser, and enter two simultaneous queries, the results returned are
> corrupted. Any suggestions? Thanks for the help.

I have an application that allows the user to perform searches and paginate through the results. Since the search really only needs to be performed once, pagination can be as simple as picking a segment of the results (stored in the session) and displayed on the screen.

I store the query that was performed as well as a "token" which is generated when the query is created. I place this token in all of the URLs on the page (most importantly, the ones involved with pagination).
If a request comes into the server including a token, I check the token against what I have in the session. If the tokens match, I skip the search. If they do not match, I re-run the search and re-set the token. Rinse, repeat.

In your case, you might want multiple simultaneous paginating queries, though I'm not exactly sure why. You could adopt a similar approach using a List of queries (using the same session key, I would imagine),
each with separate tokens for the windows.

The only problem with an implementation like this is that it is very hard to decide when you are "finished" with a query, and that it's okay to purge it from the session. That is left as an exercise for the reader
;)

Hope that helps,
-chris