From the libcurl docs:

"PRETRANSFER

CURLINFO_PRETRANSFER_TIME<http://curl.haxx.se/libcurl/c/curl_easy_getinfo.html#CURLINFOPRETRANSFERTIME>.
The time it took from the start until the file transfer is just about to
begin. This includes all pre-transfer commands and negotiations that are
specific to the particular protocol(s) involved."
From that, I'd assume it has something to do with using HTTPS, but I don't
really know anything about that. The only other resource I caould find
regarding this was the following mailing list thread:
http://curl.haxx.se/mail/curlphp-2004-06/0025.html
2008/8/18 Louise Eggleton <louisen_at_uncommonlogic.ca>

> Hello
>
> I have been trying to debug timeout/performance issues relating to
> authorizing credit cards with Authorize.net and via curl/php. Using
> curl_getinfo I have determined that the "pretransfer_time" is taking a long
> time. See below for output:
>
> ["url"]=>
> string(50) "https://secure.authorize.net/gateway/transact.dll/"
> ["content_type"]=>
> string(9) "text/html"
> ["http_code"]=>
> int(200)
> ["header_size"]=>
> int(237)
> ["request_size"]=>
> int(540)
> ["filetime"]=>
> int(-1)
> ["ssl_verify_result"]=>
> int(20)
> ["redirect_count"]=>
> int(0)
> ["total_time"]=>
> float(27.891)
> ["namelookup_time"]=>
> float(0)
> ["connect_time"]=>
> float(0.078)
> ["pretransfer_time"]=>
> float(26.672)
> ["size_upload"]=>
> float(0)
> ["size_download"]=>
> float(232)
> ["speed_download"]=>
> float(8)
> ["speed_upload"]=>
> float(0)
> ["download_content_length"]=>
> float(232)
> ["upload_content_length"]=>
> float(0)
> ["starttransfer_time"]=>
> float(27.891)
> ["redirect_time"]=>
> float(0)
>
> Could someone explain what pretransfer time is and why it might take so
> long?
>
> Louise
>
> _______________________________________________
> http://cool.haxx.se/cgi-bin/mailman/listinfo/curl-and-php
>
>

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Received on 2008-08-18