Request eyeball probes separately for reliable ISP block detection

Split HTTP measurements: general probes for performance + eyeball-only
probes (KT, LG U+) for SNI blocking detection. Ensures ISP probes are
always included regardless of random probe selection.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/services/network-diagnostic.ts

@@ -244,19 +244,29 @@ interface GlobalpingRawResult {
   };
 }
 
+interface MeasurementRequest {
+  type: 'ping' | 'http';
+  target: string;
+  eyeballOnly?: boolean;
+}
+
 async function createGlobalpingMeasurement(
-  type: 'ping' | 'http',
-  target: string
+  req: MeasurementRequest
 ): Promise<string | null> {
   try {
+    const location: Record<string, unknown> = { country: 'KR' };
+    if (req.eyeballOnly) {
+      location.tags = ['eyeball-network'];
+    }
+
     const body: Record<string, unknown> = {
-      type,
-      target,
-      locations: [{ country: 'KR' }],
-      limit: 5,
+      type: req.type,
+      target: req.target,
+      locations: [location],
+      limit: req.eyeballOnly ? 5 : 5,
     };
 
-    if (type === 'ping') {
+    if (req.type === 'ping') {
       body.measurementOptions = { packets: 3 };
     } else {
       body.measurementOptions = {
@@ -273,7 +283,8 @@ async function createGlobalpingMeasurement(
 
     if (!response.ok) {
       logger.warn('Globalping measurement creation failed', {
-        type,
+        type: req.type,
+        eyeballOnly: req.eyeballOnly,
         status: response.status,
       });
       return null;
@@ -314,20 +325,28 @@ async function pollGlobalpingResult(id: string): Promise<GlobalpingRawResult[]>
 const SNI_BLOCK_PATTERNS = ['ECONNRESET', 'connection reset', 'socket hang up'];
 
 async function checkKoreaProbes(domain: string): Promise<GlobalpingProbeResult[]> {
-  // Create ping and HTTP measurements in parallel
-  const [pingId, httpId] = await Promise.all([
-    createGlobalpingMeasurement('ping', domain),
-    createGlobalpingMeasurement('http', domain),
+  // Create 3 measurements in parallel:
+  // - ping: general probes for latency
+  // - HTTP general: datacenter probes for performance baseline
+  // - HTTP eyeball: ISP probes (KT, LG) for SNI block detection
+  const [pingId, httpId, httpEyeballId] = await Promise.all([
+    createGlobalpingMeasurement({ type: 'ping', target: domain }),
+    createGlobalpingMeasurement({ type: 'http', target: domain }),
+    createGlobalpingMeasurement({ type: 'http', target: domain, eyeballOnly: true }),
   ]);
 
-  if (!pingId && !httpId) return [];
+  if (!pingId && !httpId && !httpEyeballId) return [];
 
-  // Poll both results in parallel
-  const [pingResults, httpResults] = await Promise.all([
+  // Poll all results in parallel
+  const [pingResults, httpResults, httpEyeballResults] = await Promise.all([
     pingId ? pollGlobalpingResult(pingId) : Promise.resolve([]),
     httpId ? pollGlobalpingResult(httpId) : Promise.resolve([]),
+    httpEyeballId ? pollGlobalpingResult(httpEyeballId) : Promise.resolve([]),
   ]);
 
+  // Combine HTTP results (eyeball + general, dedup by key)
+  const allHttpResults = [...httpEyeballResults, ...httpResults];
+
   // Merge ping and HTTP results by probe city+network
   const probeMap = new Map<string, GlobalpingProbeResult>();
 
@@ -348,7 +367,7 @@ async function checkKoreaProbes(domain: string): Promise<GlobalpingProbeResult[]
     });
   }
 
-  for (const r of httpResults) {
+  for (const r of allHttpResults) {
     const key = `${r.probe.city}:${r.probe.network}`;
     const isEyeball = (r.probe.tags || []).includes('eyeball-network');
     const existing = probeMap.get(key) || {