我写了一个小脚本来诊断我网站的连接时间,结果如下:
Lookup time: 0.6454ms
Connect time: 1.1611ms
Pretransfer time: 1.1615ms
Redirect time: 0ms
Time to 1st Byte time: 43.397ms
Total time: 43.445ms
使用的代码如下:
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
if(curl_exec($ch) !== false) {
$info = curl_getinfo($ch);
echo 'Lookup time: ' . "\t\t" . ($info['namelookup_time'] * 1000) . 'ms' . PHP_EOL;
echo 'Connect time: ' . "\t\t" . ($info['connect_time'] * 1000) . 'ms' . PHP_EOL;
echo 'Pretransfer time: ' . "\t" . ($info['pretransfer_time']) . 'ms' . PHP_EOL;
echo 'Redirect time: ' . "\t\t" . ($info['redirect_time'] * 1000) . 'ms' . PHP_EOL;
echo 'Time to 1st Byte time: ' . "\t" . ($info['starttransfer_time'] * 1000) . 'ms' . PHP_EOL;
echo 'Total time: ' . "\t\t" . ($info['total_time'] * 1000) . 'ms' . PHP_EOL;
} else {
echo 'Error: ' . curl_error($ch);
}
curl_close($ch);
我不太明白上面的结果.
>为什么第一个字节的时间(TTFB)时间等于总时间?
>以上时间累计?如果是,传输时间等于0ms?
> Pretransfer时间是什么意思?
curl_getinfo($ch)的输出:
Array
(
[url] => http://www.example.com/apply.php
[content_type] => text/html
[http_code] => 302
[header_size] => 412
[request_size] => 88
[filetime] => -1
[ssl_verify_result] => 0
[redirect_count] => 0
[total_time] => 0.043445
[namelookup_time] => 0.006454
[connect_time] => 0.011611
[pretransfer_time] => 0.011615
[size_upload] => 0
[size_download] => 0
[speed_download] => 0
[speed_upload] => 0
[download_content_length] => 0
[upload_content_length] => 0
[starttransfer_time] => 0.043397
[redirect_time] => 0
[certinfo] => Array
(
)
[redirect_url] => http://www.example.com/index.php
)
最佳答案 不要花时间对请求进行彻底的分析. 0ms和0.5ms是计算机相隔的年龄;阅读原始数字以避免混淆.
1)如果HTTP请求返回单个资源(而不是完整的网页),则TTFB和总时间都是相同的,除非服务器返回的数据量相当大.
2)是的,它是累积的.增加URL返回的数据量,您将看到传输时间也将从0ms增加
3)在接受请求后等待服务器响应所花费的时间