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Re: response reading failed

From: Christian Schmitz via curl-library <curl-library_at_cool.haxx.se>
Date: Wed, 25 Sep 2019 17:58:05 +0200

Hello,

There is something we see in the logs, when this happens.
And that is progress:

Progress 0 of 0 bytes downloaded: 0%, 65537 of 139150 bytes uploaded: 47%

A normal email sending would be:

25.09.2019 17:13:35: DATA
25.09.2019 17:13:35: 354 End data with <CR><LF>.<CR><LF>
25.09.2019 17:13:35: Progress 0 of 0 bytes downloaded: 0%, 65537 of 139154 bytes uploaded: 47%
25.09.2019 17:13:35: Progress 0 of 0 bytes downloaded: 0%, 131073 of 139154 bytes uploaded: 94%
25.09.2019 17:13:35: Progress 0 of 0 bytes downloaded: 0%, 139155 of 139154 bytes uploaded: 100%
25.09.2019 17:13:35: 250 OK queued as 50edd006-c586-4eaa-9905-67507228b41d
25.09.2019 17:13:35: Connection #0 to host in-v3.mailjet.com left intact

Now I saw we set CURLOPT_BUFFERSIZE to 16384 in some older code. Not sure why.

I can comment that out and set CURLOPT_UPLOAD_BUFFERSIZE to 32768 and now it works reliable as far as I see:

25.09.2019 17:56:35: DATA
25.09.2019 17:56:35: 354 End data with <CR><LF>.<CR><LF>
25.09.2019 17:56:35: Progress 0 of 0 bytes downloaded: 0%, 32769 of 154151 bytes uploaded: 21%
25.09.2019 17:56:35: Progress 0 of 0 bytes downloaded: 0%, 65537 of 154151 bytes uploaded: 43%
25.09.2019 17:56:36: Progress 0 of 0 bytes downloaded: 0%, 98305 of 154151 bytes uploaded: 64%
25.09.2019 17:56:36: Progress 0 of 0 bytes downloaded: 0%, 131073 of 154151 bytes uploaded: 85%
25.09.2019 17:56:36: Progress 0 of 0 bytes downloaded: 0%, 154152 of 154151 bytes uploaded: 100%
25.09.2019 17:56:36: 250 OK queued as e6d6a58a-f93a-47f8-9e41-bcd77ed93e32
25.09.2019 17:56:36: Connection #0 to host in-v3.mailjet.com left intact

So could it be there is trouble when CURL sends 65537 bytes and the buffer size is just 16384?

Sincerely
Christian 

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Received on 2019-09-25