curl base

下载

指定下载文件名，已存在同名文件被覆盖

curl -o filename.ext downloadlink

继续现有下载

curl -O -C downloadlink

检测下载文件是否存在，不下载

curl -I https://www.booleanworld.com/

自动重定向

curl -L http://example.com

最多700次重定向

curl -L --max-redirs 700 example.com

无限次

curl -L --max-redirs -1 example.com

cURL can only follow redirects if the server replied with a HTTP redirect, which means that the server used a 3XX status code, and it used the Location header to indicate the new URL

查看res http header

curl -i http://example.com

verbose mode

curl -v http://example.com

• the output contains request data (marked with >)

• response headers (marked with <)

• other details about the request, such as the IP used and the SSL handshake process (marked with *).

忽略res body

curl -vo /dev/null https://www.booleanworld.com/ # Linux/MacOS
curl -vo NUL https://www.booleanworld.com/ # Windows

忽略进度条以及错误

curl -svo /dev/null https://www.booleanworld.com/ # Linux/MacOS
curl -svo NUL https://www.booleanworld.com/ # Windows

忽略进度条,保留错误

curl -sSvo /dev/null https://www.booleanworld.com/ # Linux/MacOS
curl -sSvo NUL https://www.booleanworld.com/ # Windows

只忽略进度条，其他信息保存到文件

curl -sSvo file.html https://www.booleanworld.com/

处理错误

访问网站出错时，curl返回0

curl https://www.booleanworld.com/404 -sSo file.txt

访问网站出错时，curl返回非0

curl https://www.booleanworld.com/404 -fsSo file.txt

检测协议版本

curl -v --tlsv1.2 https://www.booleanworld.com/

curl -v --sslv3 https://www.booleanworld.com/

--sslv<version> 
--tlsv<version>
--http1.0
--http1.1
--http2

时间

curl https://www.baidu.com/ -sSo /dev/null -w 'namelookup:\t%{time_namelookup}\nconnect:\t%{time_connect}\nappconnect:\t%{time_appconnect}\npretransfer:\t%{time_pretransfer}\nredirect:\t%{time_redirect}\nstarttransfer:\t%{time_starttransfer}\ntotal:\t\t%{time_total}\n'

namelookup — The time required for DNS resolution.
connect — The time required to establish the TCP connection.
appconnect — This is the time taken to establish connections for any layers between TCP and the application layer, such as SSL/TLS. In our case, the application layer is HTTP. Also, if there is no such intermediate layer (such as when there is a direct HTTP request), this time will always be 0.
pretransfer — This is the time taken from the start to when the transfer of the file is just about to begin.
redirect — This is the total time taken to process any redirects.
starttransfer — Time it took from the start to when the first byte is about to be transferred.
total — The total time taken for cURL to complete the entire process.