I am using curl to get a webpage. But sometimes it doesn't have response. I don't know why happen this. For example , i curl a webpase three times. But the first two times don't have response.
my curl version is
[root_at_panzhengyu ~]# curl --version
curl 7.61.1 (x86_64-redhat-linux-gnu) libcurl/7.61.1 OpenSSL/1.0.1e zlib/1.2.3 c-ares/1.14.0 libssh2/1.8.0 nghttp2/1.6.0
Release-Date: 2018-09-05
Protocols: dict file ftp ftps gopher http https imap imaps ldap ldaps pop3 pop3s rtsp scp sftp smb smbs smtp smtps telnet tftp
Features: AsynchDNS IPv6 Largefile GSS-API Kerberos SPNEGO NTLM NTLM_WB SSL libz HTTP2 UnixSockets HTTPS-proxy Metalink

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