[Blockchain Watcher] (FIX) Add content type header (#1114)

* Add  content type header

* Remove rcp for arbitrum

---------

Co-authored-by: julian merlo <julianmerlo@julians-MacBook-Pro.local>

blockchain-watcher/config/mainnet.json

@@ -80,11 +80,7 @@
     },
     "arbitrum": {
       "network": "mainnet",
-      "rpcs": [
-        "https://arb1.arbitrum.io/rpc",
-        "https://arbitrum.blockpi.network/v1/rpc/public",
-        "https://arbitrum-one.public.blastapi.io"
-      ]
+      "rpcs": ["https://arb1.arbitrum.io/rpc", "https://arbitrum.blockpi.network/v1/rpc/public"]
     },
     "optimism": {
       "network": "mainnet",

blockchain-watcher/package.json

@@ -3,7 +3,6 @@
   "version": "0.0.5",
   "description": "A process for watching blockchain events and moving them to persistent storage",
   "main": "index.js",
-  "type": "module",
   "scripts": {
     "start": "node lib/start.js",
     "start:ncc": "node lib/index.js",

blockchain-watcher/src/infrastructure/rpc/http/InstrumentedHttpProvider.ts

@@ -43,6 +43,9 @@ export class InstrumentedHttpProvider {
         method: method,
         body: JSON.stringify(body),
         signal: AbortSignal.timeout(opts?.timeout ?? this.timeout),
+        headers: {
+          "Content-Type": "application/json",
+        },
       });
     } catch (err: AxiosError | any) {
       // Connection / timeout error: