function _M.connect_proxy()

in lib/resty/http.lua [1094:1140]

• 33 lines of code
• 7 McCabe index (conditional complexity)

function _M.connect_proxy(self, proxy_uri, scheme, host, port, proxy_authorization)
    
    local parsed_proxy_uri, err = self:parse_uri(proxy_uri, false)
    if not parsed_proxy_uri then
        return nil, err
    end

    
    
    local proxy_scheme = parsed_proxy_uri[1]
    if proxy_scheme ~= "http" then
        return nil, "protocol " .. proxy_scheme .. " not supported for proxy connections"
    end

    
    local proxy_host, proxy_port = parsed_proxy_uri[2], parsed_proxy_uri[3]
    local c, err = self:connect(proxy_host, proxy_port)
    if not c then
        return nil, err
    end

    if scheme == "https" then
        
        
        
        
        local destination = host .. ":" .. port
        local res, err = self:request({
            method = "CONNECT",
            path = destination,
            headers = {
                ["Host"] = destination,
                ["Proxy-Authorization"] = proxy_authorization,
            }
        })

        if not res then
            return nil, err
        end

        if res.status < 200 or res.status > 299 then
            return nil, "failed to establish a tunnel through a proxy: " .. res.status
        end
    end

    return c, nil
end