Re: "Connection is still name resolving, can't reuse" error

@Daniel Stenberg <daniel_at_haxx.se> Thanks for the reply.
Instead of connection cache, I have implemented a custom class that allows
multiple threads to share the connection pool, it seems working OK except a
few thing.
With this new change, I am now starting to get "Expect: 100-continue",
which makes it wait for a server response for 1 second. This slows down my
application, so I've set CURLOPT_EXPECT_100_TIMEOUT_MS to 1ms.
With this change, my application became almost as fast as before, but I am
not sure if 1ms is desirable. The request is eventually made without error,
and received 200 OK though.

I am sure my new change with the connection pool is causing this
100-continue because without this change, no 100-continue occurred.
However, I have been struggling to pinpoint why/what is really causing this
"100-continue", so
I will very much appreciate if you can provide any help!

Here is the sanitized log that shows connections are being shared, and gets
100-continue.

...
Curl text: Re-using existing connection! (#0) with host MY_CONN
Curl text: Connected to MY_CONN (#0)
Curl header out: PUT /Test_0 HTTP/1.1
Host:
Accept: */*
authorization:
content-length: 1024
content-type:
user-agent:
x-amz-content-sha256: UNSIGNED-PAYLOAD
x-amz-date:
Expect: 100-continue
Curl text: Done waiting for 100-continue
Curl text: Mark bundle as not supporting multiuse
Curl header in: HTTP/1.1 200 OK
...
Curl text: Connection #0 to host MY_CONN left intact

Best,

On Mon, May 11, 2020 at 1:24 AM Daniel Stenberg <daniel_at_haxx.se> wrote:

> On Fri, 8 May 2020, Leo Song via curl-library wrote:
>
> > I am trying to use the share interface to share connection among
> threads,
> > and keep encountering " Connection # is still name resolving, can't
> reuse"
> > error.
>
> I'm sorry, but right now you should disable connection cache sharing
> between
> threads. It's too buggy. See https://github.com/curl/curl/issues/4915 for
> details.
>
> To make it worse: fixing it requires a larger take and I've not yet been
> able
> to muster the time and energy to adress it. :-/
>
> --
>
> / daniel.haxx.se | Commercial curl support up to 24x7 is available!
> | Private help, bug fixes, support, ports, new features
> | https://www.wolfssl.com/contact/
>

-- 
Best regards,
Kyung Joon Song.

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Received on 2020-06-02