added option to force ipv4 or ipv6 for http(s) monitor type (#5880)

Co-authored-by: Ionys <9364594+Ionys320@users.noreply.github.com>
Co-authored-by: Frank Elsinga <frank@elsinga.de>

db/knex_migrations/2025-06-03-0000-add-ip-family.js

@@ -0,0 +1,13 @@
+exports.up = function (knex) {
+    return knex.schema
+        .alterTable("monitor", function (table) {
+            table.boolean("ip_family").defaultTo(null);
+        });
+};
+
+exports.down = function (knex) {
+    return knex.schema
+        .alterTable("monitor", function (table) {
+            table.dropColumn("ip_family");
+        });
+};

server/model/monitor.js

@@ -160,6 +160,7 @@ class Monitor extends BeanModel {
             smtpSecurity: this.smtpSecurity,
             rabbitmqNodes: JSON.parse(this.rabbitmqNodes),
             conditions: JSON.parse(this.conditions),
+            ipFamily: this.ipFamily,
 
             // ping advanced options
             ping_numeric: this.isPingNumeric(),
@@ -426,10 +427,26 @@ class Monitor extends BeanModel {
                         }
                     }
 
+                    let agentFamily = undefined;
+                    if (this.ipFamily === "ipv4") {
+                        agentFamily = 4;
+                    }
+                    if (this.ipFamily === "ipv6") {
+                        agentFamily = 6;
+                    }
+
                     const httpsAgentOptions = {
                         maxCachedSessions: 0, // Use Custom agent to disable session reuse (https://github.com/nodejs/node/issues/3940)
                         rejectUnauthorized: !this.getIgnoreTls(),
                         secureOptions: crypto.constants.SSL_OP_LEGACY_SERVER_CONNECT,
+                        autoSelectFamily: true,
+                        ...(agentFamily ? { family: agentFamily } : {})
+                    };
+
+                    const httpAgentOptions = {
+                        maxCachedSessions: 0,
+                        autoSelectFamily: true,
+                        ...(agentFamily ? { family: agentFamily } : {})
                     };
 
                     log.debug("monitor", `[${this.name}] Prepare Options for axios`);
@@ -491,6 +508,7 @@ class Monitor extends BeanModel {
                         if (proxy && proxy.active) {
                             const { httpAgent, httpsAgent } = Proxy.createAgents(proxy, {
                                 httpsAgentOptions: httpsAgentOptions,
+                                httpAgentOptions: httpAgentOptions,
                             });
 
                             options.proxy = false;
@@ -499,6 +517,10 @@ class Monitor extends BeanModel {
                         }
                     }
 
+                    if (!options.httpAgent) {
+                        options.httpAgent = new http.Agent(httpAgentOptions);
+                    }
+
                     if (!options.httpsAgent) {
                         let jar = new CookieJar();
                         let httpsCookieAgentOptions = {

server/server.js

@@ -792,6 +792,7 @@ let needSetup = false;
                 bean.url = monitor.url;
                 bean.method = monitor.method;
                 bean.body = monitor.body;
+                bean.ipFamily = monitor.ipFamily;
                 bean.headers = monitor.headers;
                 bean.basic_auth_user = monitor.basic_auth_user;
                 bean.basic_auth_pass = monitor.basic_auth_pass;

src/lang/en.json

@@ -1116,6 +1116,9 @@
     "Sender name": "Sender name",
     "smsplanetNeedToApproveName": "Needs to be approved in the client panel",
     "Disable URL in Notification": "Disable URL in Notification",
+    "Ip Family": "IP Family",
+    "ipFamilyDescriptionAutoSelect": "Uses the {happyEyeballs} for determining the IP family.",
+    "Happy Eyeballs algorithm": "Happy Eyeballs algorithm",
     "Add Another Tag": "Add Another Tag",
     "Staged Tags for Batch Add": "Staged Tags for Batch Add",
     "Clear Form": "Clear Form",

src/pages/EditMonitor.vue

@@ -745,6 +745,20 @@
                                         {{ $t("acceptedStatusCodesDescription") }}
                                     </div>
                                 </div>
+
+                                <div class="my-3">
+                                    <label for="ipFamily" class="form-label">{{ $t("Ip Family") }}</label>
+                                    <select id="ipFamily" v-model="monitor.ipFamily" class="form-select">
+                                        <option :value="null">{{ $t("auto-select") }}</option>
+                                        <option value="ipv4">IPv4</option>
+                                        <option value="ipv6">IPv6</option>
+                                    </select>
+                                    <i18n-t v-if="monitor.ipFamily == null" keypath="ipFamilyDescriptionAutoSelect" tag="div" class="form-text">
+                                        <template #happyEyeballs>
+                                            <a href="https://en.wikipedia.org/wiki/Happy_Eyeballs" target="_blank">{{ $t("Happy Eyeballs algorithm") }}</a>
+                                        </template>
+                                    </i18n-t>
+                                </div>
                             </template>
 
                             <!-- Parent Monitor -->
@@ -1129,6 +1143,7 @@ const monitorDefaults = {
     parent: null,
     url: "https://",
     method: "GET",
+    ipFamily: null,
     interval: 60,
     retryInterval: 60,
     resendInterval: 0,