解决 curl: Protocol "https" not supported or disabled in libcurl #77
Description
一、现象
在Centos7环境下，执行curl命令报错：
curl: (1) Protocol "https" not supported or disabled in libcurl
二、解决方法
1、检查curl版本情况
[root@~]# curl -V
curl 7.55.1 (x86_64-pc-linux-gnu) libcurl/7.55.1
Release-Date: 2017-08-14
Protocols: dict file ftp gopher http imap pop3 rtsp smtp telnet tftp
Features: AsynchDNS IPv6 Largefile UnixSockets
从结果看，系统安装的curl版本确实不支持https，因此需要重新安装curl
2、重新安装openssl版本
执行以下命令：
[root]# vi install_openssl.sh
#!/bin/bash
wget https://www.openssl.org/source/openssl-1.1.1c.tar.gz
tar -zxvf openssl-1.1.1c.tar.gz
cd openssl-1.1.1c
./config --prefix=/usr/local/openssl #如果此步骤报错,需要安装perl以及gcc包
make && make install
mv /usr/bin/openssl /usr/bin/openssl.bak
ln -sf /usr/local/openssl/bin/openssl /usr/bin/openssl
echo "/usr/local/openssl/lib" >> /etc/ld.so.conf
ldconfig -v
[root]# sh install_openssl.sh
[root]# openssl version
3、重新安装curl
执行以下命令：
[root]# vi install_curl.sh
#!/bin/bash
wget https://curl.se/download/curl-7.78.0.tar.gz
tar -zxvf curl-7.78.0.tar.gz
cd curl-7.78.0/
./configure -with-ssh=/usr/local/ssl
make
make install
[root]# sh install_curl.sh在编译curl的时候报错：
vtls/openssl.c: In function ‘Curl_ossl_seed’:
vtls/openssl.c:279:5: error: implicit declaration of function ‘RAND_egd’ [-Werror=implicit-function-declaration]
int ret = RAND_egd(data->set.str[STRING_SSL_EGDSOCKET]?
^
cc1: some warnings being treated as errors
Makefile:2023: recipe for target 'vtls/libcurl_la-openssl.lo' failed
make[2]: *** [vtls/libcurl_la-openssl.lo] Error 1
原因是系统中安装了多个openssl的包，处理方法是：
yum remove openssl-devel
重新执行一遍
cd curl-7.78.0/
./configure -with-ssh=/usr/local/ssl
make
make install
确认版本号, 已经增加了“https”模块
[root]# curl --version
curl 7.78.0 (x86_64-pc-linux-gnu) libcurl/7.78.0 OpenSSL/1.1.1c zlib/1.2.7
Release-Date: 2021-07-21
Protocols: dict file ftp ftps gopher gophers http https imap imaps mqtt pop3 pop3s rtsp smb smbs smtp smtps telnet tftp
Features: alt-svc AsynchDNS HSTS HTTPS-proxy IPv6 Largefile libz NTLM NTLM_WB SSL TLS-SRP UnixSockets