优化sni拦截器

packages/mitmproxy/src/lib/interceptor/impl/req/proxy.js

@@ -64,7 +64,9 @@ module.exports = {
 
     if (interceptOpt.sni != null) {
       rOptions.servername = interceptOpt.sni
-      rOptions.agent.options.rejectUnauthorized = false
+      if (rOptions.agent) {
+        rOptions.agent.options.rejectUnauthorized = false
+      }
     }
     return true
   },

packages/mitmproxy/src/lib/interceptor/impl/req/sni.js

@@ -3,6 +3,9 @@ module.exports = {
     const { rOptions, log } = context
     if (interceptOpt.sni != null) {
       rOptions.servername = interceptOpt.sni
+      if (rOptions.agent) {
+        rOptions.agent.options.rejectUnauthorized = false
+      }
       log.info('sni intercept: sni replace servername:', rOptions.hostname, '➜', rOptions.servername)
     }
     return true

packages/mitmproxy/src/lib/proxy/common/util.js

@@ -40,7 +40,7 @@ util.getOptionsFromRequest = (req, ssl, externalProxy = null) => {
   }
 
   delete headers['proxy-connection']
-  let agent = false
+  let agent
   if (!externalProxyUrl) {
     // keepAlive
     if (headers.connection !== 'close') {
@@ -50,6 +50,8 @@ util.getOptionsFromRequest = (req, ssl, externalProxy = null) => {
         agent = httpAgent
       }
       headers.connection = 'keep-alive'
+    } else {
+      agent = false
     }
   } else {
     agent = util.getTunnelAgent(protocol === 'https:', externalProxyUrl)