CURL -w 参数详解


  1. url_effective 最终获取的url地址,尤其是当你指定给curl的地址存在301跳转,且通过-L继续追踪的情形。
  2. http_code http状态码,如200成功,301转向,404未找到,500服务器错误等。(The numerical response code that was found in the last retrieved HTTP(S) or FTP(s) transfer. In 7.18.2 the alias response_code was added to show the same info.)
  3. http_connect The numerical code that was found in the last response (from a proxy) to a curl CONNECT request. (Added in 7.12.4)
  4. time_total 总时间,按秒计。精确到小数点后三位。 (The total time, in seconds, that the full operation lasted. The time will be displayed with millisecond resolution.)
  5. time_namelookup DNS解析时间,从请求开始到DNS解析完毕所用时间。(The time, in seconds, it took from the start until the name resolving was completed.)
  6. time_connect 连接时间,从开始到建立TCP连接完成所用时间,包括前边DNS解析时间,如果需要单纯的得到连接时间,用这个time_connect时间减去前边time_namelookup时间。以下同理,不再赘述。(The time, in seconds, it took from the start until the TCP connect to the remote host (or proxy) was completed.)
  7. time_appconnect 连接建立完成时间,如SSL/SSH等建立连接或者完成三次握手时间。(The time, in seconds, it took from the start until the SSL/SSH/etc connect/handshake to the remote host was completed. (Added in 7.19.0))
  8. time_pretransfer 从开始到准备传输的时间。(The time, in seconds, it took from the start until the file transfer was just about to begin. This includes all pre-transfer commands and negotiations that are specific to the particular protocol(s) involved.)
  9. time_redirect 重定向时间,包括到最后一次传输前的几次重定向的DNS解析,连接,预传输,传输时间。(The time, in seconds, it took for all redirection steps include name lookup, connect, pretransfer and transfer before the final transaction was started. time_redirect shows the complete execution time for multiple redirections. (Added in 7.12.3))
  10. time_starttransfer 开始传输时间。在发出请求之后,Web 服务器返回数据的第一个字节所用的时间(The time, in seconds, it took from the start until the first byte was just about to be transferred. This includes time_pretransfer and also the time the server needed to calculate the result.)
  11. size_download 下载大小。(The total amount of bytes that were downloaded.)
  12. size_upload 上传大小。(The total amount of bytes that were uploaded.) 
    size_header 下载的header的大小(The total amount of bytes of the downloaded headers.)
  13. size_request 请求的大小。(The total amount of bytes that were sent in the HTTP request.)
  14. speed_download 下载速度,单位-字节每秒。(The average download speed that curl measured for the complete download. Bytes per second.)
  15. speed_upload 上传速度,单位-字节每秒。(The average upload speed that curl measured for the complete upload. Bytes per second.)
  16. content_type 就是content-Type,不用多说了,这是一个访问我博客首页返回的结果示例(text/html; charset=UTF-8);(The Content-Type of the requested document, if there was any.)
  17. num_connects 最近的的一次传输中创建的连接数目。Number of new connects made in the recent transfer. (Added in 7.12.3)
  18. num_redirects 在请求中跳转的次数。Number of redirects that were followed in the request. (Added in 7.12.3)
  19. redirect_url When a HTTP request was made without -L to follow redirects, this variable will show the actual URL a redirect would take you to. (Added in 7.18.2)
  20. ftp_entry_path 当连接到远程的ftp服务器时的初始路径。The initial path libcurl ended up in when logging on to the remote FTP server. (Added in 7.15.4)
  21. ssl_verify_result ssl认证结果,返回0表示认证成功。( The result of the SSL peer certificate verification that was requested. 0 means the verification was successful. (Added in 7.19.0))



curl -o /dev/null -s -w "time_connect: %{time_connect}\ntime_starttransfer: %{time_starttransfer}\ntime_nslookup:%{time_namelookup}\ntime_total: %{time_total}\n" ""
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time_connect: 0.154

time_starttransfer: 0.243


time_total: 0.243

说明: 以上显示网络连接时间为0.154秒(其中DNS解析为0.150秒),总体请求0.243秒。DNS解析出现故障的概率在正式环境中比较高,所以在诊断时候千万别漏了time_namelookup这个参数。

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