fix: Don't load startup URL in HTTP Server mode

I think this is the source of a long-standing issue in the HTTP Server
where it would just freeze after a certain period of time. Every
successful page load, wether it was explicitly requested as a raw-text
request or not, attempts to send a raw text payload on page load. So I
think the automatic default home page startup loading was confusing
things.

Fixes #207

interfacer/src/browsh/browsh.go

@@ -37,9 +37,10 @@ var (
    ********///////////////
      ***********************`
 	// IsTesting is used in tests, so it needs to be exported
-	IsTesting = false
-	logfile   string
-	_         = pflag.Bool("version", false, "Output current Browsh version")
+	IsTesting        = false
+	IsHTTPServerMode = false
+	logfile          string
+	_                = pflag.Bool("version", false, "Output current Browsh version")
 )
 
 func setupLogging() {

interfacer/src/browsh/comms.go

@@ -158,7 +158,9 @@ func webSocketServer(w http.ResponseWriter, r *http.Request) {
 	// work. So we do it here instead.
 	validURL := viper.GetStringSlice("validURL")
 	if len(validURL) == 0 {
-		sendMessageToWebExtension("/new_tab," + viper.GetString("startup-url"))
+		if !IsHTTPServerMode {
+			sendMessageToWebExtension("/new_tab," + viper.GetString("startup-url"))
+		}
 	} else {
 		for i := 0; i < len(validURL); i++ {
 			sendMessageToWebExtension("/new_tab," + validURL[i])

interfacer/src/browsh/raw_text_server.go

@@ -66,6 +66,7 @@ type rawTextResponse struct {
 // it will return:
 // `Something                                                                    `
 func HTTPServerStart() {
+	IsHTTPServerMode = true
 	StartFirefox()
 	go startWebSocketServer()
 	Log("Starting Browsh HTTP server")

webext/src/background/tab_commands_mixin.js

@@ -47,11 +47,16 @@ export default MixinBase =>
     }
 
     _rawTextRequest(incoming) {
-      let payload = {
-        json: JSON.stringify(incoming),
-        request_id: this.request_id
-      };
-      this.sendToTerminal(`/raw_text,${JSON.stringify(payload)}`);
+      // I think the only reason that a tab would send a raw text payload is the
+      // automatic startup URL loading, which should now be disabled for HTTP Server
+      // mode.
+      if (this.request_id) {
+        let payload = {
+          json: JSON.stringify(incoming),
+          request_id: this.request_id
+        };
+        this.sendToTerminal(`/raw_text,${JSON.stringify(payload)}`);
+      }
       this._tabCount(count => {
         if (count > 1) {
           this.remove();