Better download logging

Author: keithrob

tool.ts

@@ -247,6 +247,16 @@ export async function downloadTool(url: string, fileName?: string): Promise<stri
             })
         }
         catch (error) {
+            if (error.code){
+                // Print the HTTP Error code.  These are always set when
+                // there is a proxy problem.  Two usual suspects are:
+                // UNABLE_TO_VERIFY_LEAF_SIGNATURE: True when your proxy
+                // is expressing a self signed cert or when you need
+                // to trust the root CA from your proxy.
+                // UNABLE_TO_GET_ISSUER_CERT_LOCALLY: Seems to be set
+                // when you haven't trusted intermediate CA of your proxy.
+                tl.error(`Error code is(${error.code})`)
+            }
             reject(error);
         }
     });
@@ -486,7 +496,7 @@ function _createExtractFolder(dest?: string): string {
     }
 
     tl.mkdirP(dest);
-    
+
     return dest;
 }