操作方法
默认情况下，curl 不会输出耗时信息，状态码等，若需要输出，需要使用 -w, --write-out FORMAT 选项配置 Write Out 格式。
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| curl -w "\n\ntime_total: %{time_total}s\n" https://www.example.com
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Write Out 中支持的变量请参考：
https://everything.curl.dev/usingcurl/verbose/writeout#available-write-out-variables
也可以使用文件
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| curl -w "@curl-format.txt" https://www.example.com
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一个简单的文件格式参考如下：
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| \n
time_namelookup: %{time_namelookup}s\n
time_connect: %{time_connect}s\n
time_appconnect: %{time_appconnect}s\n
time_pretransfer: %{time_pretransfer}s\n
time_redirect: %{time_redirect}s\n
time_starttransfer: %{time_starttransfer}s\n
----------\n
time_total: %{time_total}s\n
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用于 debug 的详细信息格式参考：
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| \n
url_effective: %{url_effective}\n
ssl_verify_result: %{ssl_verify_result}\n
content_type: %{content_type}\n
filename_effective: %{filename_effective}\n
ftp_entry_path: %{ftp_entry_path}\n
http_code: %{http_code}\n
http_connect: %{http_connect}\n
local_ip: %{local_ip}\n
local_port: %{local_port}\n
num_connects: %{num_connects}\n
num_redirects: %{num_redirects}\n
redirect_url: %{redirect_url}\n
remote_ip: %{remote_ip}\n
remote_port: %{remote_port}\n
response_code: %{response_code}\n
size_download: %{size_download} bytes\n
size_header: %{size_header} bytes\n
size_request: %{size_request} bytes\n
size_upload: %{size_upload} bytes\n
speed_download: %{speed_download} bytes/s\n
speed_upload: %{speed_upload} bytes/s\n
time_appconnect: %{time_appconnect}s\n
time_connect: %{time_connect}s\n
time_namelookup: %{time_namelookup}s\n
time_pretransfer: %{time_pretransfer}s\n
time_redirect: %{time_redirect}s\n
time_starttransfer: %{time_starttransfer}s\n
time_total: %{time_total}s\n
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