On Thu, Apr 2, 2009 at 3:48 PM, Niranjan Ramakrishnan <
willowbreaker_at_hotmail.com> wrote:

> So if I understand this right ,
> 1. There is no sessionid reuse when I invoke "curl -k https://URL-PATH<https://url-path/>" twice ( separate invocations ).
>

Correct

>
> 2. When I invoke curl -k https://URL-PATH <https://url-path/> curl -k
> https://URL-PATH <https://url-path/> curl -k https://URL-PATH<https://url-path/>, all three requests happen within the same TCP connection and so the
> question of sessionid reuse does not arise.
>

I don't think the above command will work, but something like this allow the
SSL sessions to be reused:

curl https://URL-PATH <https://url-path/> https://URL-PATH<https://url-path/>

I say might because I really don't know for sure. It might depend upon
whether curl processes the requests simultaneously or synchronously. I
believe there are some implementation anomalies here. Read the code if you
want to know for sure.

>
> In which case , when would I use the -no-sessionid flag ? What purpose
> exactly does this flag serve ?
>
Have you read the doc: http://curl.haxx.se/docs/manpage.html

Here is a quote:

"--no-sessionid

(SSL) Disable curl's use of SSL session-ID caching. By default all transfers
are done using the cache. Note that while nothing should ever get hurt by
attempting to reuse SSL session-IDs, there seem to be broken SSL
implementations in the wild that may require you to disable this in order
for you to succeed. (Added in 7.16.0)"

OK, I've taken the effort to answer your questions. Now answer mine. Why
do you care? Why is it important to you to reuse SSL sessions? Is it a
performance reason or a functional one (e.g. it's broke)? If it is
performance, what is your estimate of the additional cost for not reusing
SSL sessions?

Ray

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Received on 2009-04-03