fix issue with invalid third-party proxy ending up in the valid third-party list

src/proxy/threads.go

@@ -78,15 +78,18 @@ func (p *ForwardProxyCluster) ValidateProxiesThread() {
 
 				// Sort the proxy into the right groups.
 				if isThirdparty(pxy) {
-					newThirdpartyOnlineProxies = append(newThirdpartyOnlineProxies, pxy)
-
+					okToAdd := true
 					for _, d := range config.GetConfig().ThirdpartyTestUrls {
 						_, bv3hiErr := sendRequestThroughProxy(pxy, d)
 						if bv3hiErr != nil {
-							log.Debugf("Validate - Third-party %s failed: %s", proxyHost, bv3hiErr)
+							okToAdd = false
 							newThirdpartyBrokenProxies = append(newThirdpartyBrokenProxies, pxy)
+							log.Debugf("Validate - Third-party %s failed: %s", proxyHost, bv3hiErr)
 						}
 					}
+					if okToAdd {
+						newThirdpartyOnlineProxies = append(newThirdpartyOnlineProxies, pxy)
+					}
 				} else {
 					newOurOnlineProxies = append(newOurOnlineProxies, pxy)
 				}