curl command (to be continued ...)

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1. curl is a command-line open source tools and libraries for data transmission, using URL syntax, supporting many transport protocols, including: HTTP, HTTPS, FTP, FTPS, GOPHER, TFTP, SCP, SFTP, SMB, TELNET, DICT , LDAP, LDAPS, FILE, IMAP, SMTP, POP3, RTSP and RTMP. curl library provides many powerful features, you can use it to perform HTTP / HTTPS request, upload / download files, and support for Cookie, authentication, proxy, speed limits, etc.
2. Function is a network request, and then extracting the data obtained, shown in the above stdout.
   On the server side, using a curl request to view the address data to determine whether the return is nginx configuration problems or Service configuration problems it is a good way (curl -i "...")!