Update browser fingerprint headers and observability config

Refined the generateBrowserFingerprint function to use more realistic and concise HTTP headers. Updated wrangler.jsonc to disable general observability but enable and configure detailed logging and tracing with persistence and full sampling.

src/lib/proxyManager.ts

@@ -68,23 +68,18 @@ export async function selectProxy(env: Env): Promise<ProxyEndpoint | null> {
 
 /**
  * Generate realistic browser fingerprint headers
- * Creates randomized headers to mimic real browser requests and prevent 503 errors
- * Enhanced with comprehensive headers to bypass DeepL's bot detection
+ * Creates randomized headers to mimic real browser requests
  * @returns Record<string, string> - Object containing HTTP headers
  */
 export function generateBrowserFingerprint(): Record<string, string> {
   return {
     "User-Agent": USER_AGENTS[Math.floor(Math.random() * USER_AGENTS.length)],
-    Accept: "*/*",
     "Accept-Language":
       ACCEPT_LANGUAGES[Math.floor(Math.random() * ACCEPT_LANGUAGES.length)],
-    "Accept-Encoding": "gzip, deflate, br, zstd",
-    Origin: "https://www.deepl.com",
-    Referer: "https://www.deepl.com/",
-    "Sec-Fetch-Dest": "empty",
-    "Sec-Fetch-Mode": "cors",
-    "Sec-Fetch-Site": "same-site",
+    Accept: "application/json, text/plain, */*",
+    "Accept-Encoding": "gzip, deflate, br",
     DNT: "1",
     Connection: "keep-alive",
+    "Upgrade-Insecure-Requests": "1",
   };
 }

wrangler.jsonc

@@ -22,7 +22,19 @@
   "main": "src/index.ts",
   "name": "deeplx",
   "observability": {
-    "enabled": true
+    "enabled": false,
+    "head_sampling_rate": 1,
+    "logs": {
+      "enabled": true,
+      "head_sampling_rate": 1,
+      "invocation_logs": true,
+      "persist": true
+    },
+    "traces": {
+      "enabled": true,
+      "head_sampling_rate": 1,
+      "persist": true
+    }
   },
   "placement": {
     "mode": "smart"