fix: httpclient proxy

Author: Dipper30

lib/egg.js

@@ -312,6 +312,14 @@ class EggApplication extends EggCore {
           }
           return value;
         },
+        set(_target, prop, value) {
+          if (!realClient) {
+            options.lookup = options.lookup ?? self.config.httpclient.lookup;
+            realClient = new self.HttpClientNext(self, options);
+          }
+          realClient[prop] = value;
+          return true;
+        }
       });
     } else if (this.config.httpclient?.enableDNSCache) {
       httpClient = new DNSCacheHttpClient(this, options);