Update libs/remix-core-plugin/src/lib/helpers/fetch-etherscan.ts

Co-authored-by: Copilot <[email protected]>

Author: bunsenstraat

libs/remix-core-plugin/src/lib/helpers/fetch-etherscan.ts

@@ -25,14 +25,33 @@ export const fetchContractFromEtherscan = async (plugin, endpoint: string | Netw
       // Prefer central V2 API host with chainid param (works across Etherscan-supported networks)
       const v2CentralUrl = 'https://api.etherscan.io/v2/api?chainid=' + chainId + '&module=contract&action=getsourcecode&address=' + contractAddress + '&apikey=' + etherscanKey
       let response = await fetch(v2CentralUrl)
+      let centralV2Status = response.status;
+      let centralV2StatusText = response.statusText;
 
       // If central V2 not OK, try per-network V2, then per-network V1
       if (!response.ok) {
         const v2PerNetworkUrl = 'https://' + endpointStr + '/v2/api?chainid=' + chainId + '&module=contract&action=getsourcecode&address=' + contractAddress + '&apikey=' + etherscanKey
-        response = await fetch(v2PerNetworkUrl)
-        if (!response.ok) {
+        let v2PerNetworkResponse = await fetch(v2PerNetworkUrl)
+        let v2PerNetworkStatus = v2PerNetworkResponse.status;
+        let v2PerNetworkStatusText = v2PerNetworkResponse.statusText;
+        if (v2PerNetworkResponse.ok) {
+          response = v2PerNetworkResponse;
+        } else {
           const v1Url = 'https://' + endpointStr + '/api?module=contract&action=getsourcecode&address=' + contractAddress + '&apikey=' + etherscanKey
-          response = await fetch(v1Url)
+          let v1Response = await fetch(v1Url)
+          let v1Status = v1Response.status;
+          let v1StatusText = v1Response.statusText;
+          if (v1Response.ok) {
+            response = v1Response;
+          } else {
+            // All three endpoints failed, throw a descriptive error
+            throw new Error(
+              `All Etherscan API endpoints failed:\n` +
+              `Central V2: ${v2CentralUrl} [${centralV2Status} ${centralV2StatusText}]\n` +
+              `Per-network V2: ${v2PerNetworkUrl} [${v2PerNetworkStatus} ${v2PerNetworkStatusText}]\n` +
+              `Per-network V1: ${v1Url} [${v1Status} ${v1StatusText}]`
+            );
+          }
         }
       }