Add requestHeaders config option and defaults

`requestHeaders` is a configurable option now. Default values are based
on the other integrations using Node.js naming conventions for them.

packages/nodejs/src/__tests__/config.test.ts

@@ -29,6 +29,22 @@ describe("Configuration", () => {
     ignoreNamespaces: [],
     log: "file",
     logPath: "/tmp",
+    requestHeaders: [
+      "accept",
+      "accept-charset",
+      "accept-encoding",
+      "accept-language",
+      "cache-control",
+      "connection",
+      "content-length",
+      "path-info",
+      "range",
+      "request-method",
+      "request-uri",
+      "server-name",
+      "server-port",
+      "server-protocol"
+    ],
     transactionDebugMode: false
   }
 

packages/nodejs/src/cli/diagnose.ts

@@ -416,5 +416,9 @@ export class Diagnose {
 }
 
 function format_value(value: any) {
-  return util.inspect(value)
+  if (typeof value == "object") {
+    return JSON.stringify(value)
+  } else {
+    return util.inspect(value)
+  }
 }

packages/nodejs/src/config.ts

@@ -120,6 +120,22 @@ export class Configuration {
       ignoreNamespaces: [],
       log: "file",
       logPath: this._tmpdir(),
+      requestHeaders: [
+        "accept",
+        "accept-charset",
+        "accept-encoding",
+        "accept-language",
+        "cache-control",
+        "connection",
+        "content-length",
+        "path-info",
+        "range",
+        "request-method",
+        "request-uri",
+        "server-name",
+        "server-port",
+        "server-protocol"
+      ],
       transactionDebugMode: false
     }
   }

packages/nodejs/src/config/configmap.ts

@@ -79,6 +79,7 @@ export const JS_TO_RUBY_MAPPING: { [key: string]: string } = {
   log: "log",
   logPath: "log_path",
   name: "name",
+  requestHeaders: "request_headers",
   revision: "revision",
   runningInContainer: "running_in_container",
   transactionDebugMode: "transaction_debug_mode",