使用 cURL 获取站点的各类响应时间 – dns解析时间,响应时间,传输时间等:

curl -o /dev/null -s -w %{http_code}:%{http_connect}:%{content_type}:%{time_namelookup}:%{time_redirect}:%{time_pretransfer}:%{time_connect}:%{time_starttransfer}:%{time_total}:%{speed_download} digdeeply.org

这是一个本人博客站点执行 curl 命令的情况。输出通常是 HTML 代码,通过 -o 参数发送到 /dev/null。-s 参数去掉所有状态信息。-w 参数让 curl 输出的计时器的状态信息。

一次http请求中的各个时间段-dns解析,等待服务器响应,获取内容等

一次http请求中的各个时间段-dns解析,等待服务器响应,获取内容等

下边对-w参数做个详细的解释,由我(DigDeeply)翻译。有不对的地方请大家指出。(英文原文:http://curl.haxx.se/docs/manpage.html)

以下是可用的变量名:

 -w, --write-out <format>
   以下变量会按CURL认为合适的格式输出,输出变量需要按照%{variable_name}的格式,如果需要输出%,double一下即可,即%%,同时,n是换行,r是回车,t是TAB。

url_effective The URL that was fetched last. This is most meaningful if you've told curl to follow location: headers.

filename_effective The ultimate filename that curl writes out to. This is only meaningful if curl is told to write to a file with the --remote-name or --output option. It's most useful in combination with the --remote-header-name option. (Added in 7.25.1)

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.)

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)

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.)

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.)

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.)

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))

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.)

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))

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.)

size_download 下载大小。(The total amount of bytes that were downloaded.)

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.)

size_request 请求的大小。(The total amount of bytes that were sent in the HTTP request.)

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.)

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.)

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.)

num_connects Number of new connects made in the recent transfer. (Added in 7.12.3)

num_redirects Number of redirects that were followed in the request. (Added in 7.12.3)

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)

ftp_entry_path The initial path libcurl ended up in when logging on to the remote FTP server. (Added in 7.15.4)

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))

若多次使用-w参数,按最后一个的格式输出。If this option is used several times, the last one will be used.

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