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• 1v91 HTTP server callback called twice

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• 1v91 HTTP server callback called twice

  in ESP8266 • 7 years, 8 months

  

  That sounds like a good explanation. I'm so used to using a router I overlooked that it would request a favicon too.

  Thanks

• 1v91 HTTP server callback called twice

  in ESP8266 • 7 years, 8 months

  

  I have just got started using Espruino, it looks great, but I have come across a few issues. I don't know if it's my fault, but I have found that when I use the built in HTTP server the callback function is called twice. Once with the query parameters, and once (second time) with them nulled out. This

  I am using using a compiler to generate my JS, so it's slightly awkward but still readable. Here is the callback used by wifi.connect()

   var onConnected = function onConnected(err) {
      if (err == null) {
        console.log("IP: " + wifi.getIP().ip);
  
        var http = require("http");
  
        var callback = function callback(request, response) {
          var query = void 0;
          var matchValue = url.parse(request.url, true).query;
  
          if (matchValue == null) {
            query = null;
          } else {
            query = matchValue;
          }
  
          response.writeHead(200);
          response.write("<a href=\"?led=1\">on</a><br/><a href=\"?led=0\">off</a>");
          response.end("sup dawg?");
          console.log("Callback called");
  
          if (query != null) {
            var matchValue_1 = query.led;
  
            if (matchValue_1 === "1") {
              digitalWrite(outPutPin, 1);
            } else {
              digitalWrite(outPutPin, 0);
            }
          }
        };
  
        var server = http.createServer(callback);
        server.listen(80);
      } else {
        console.log("Error: " + err);
      }
    };    
  

  log output from hitting the page once:

  =undefined
  IP: 192.168.1.102
  Callback called
  Callback called
  

  The work around I'm using is just to only set the LEDs if the query is not null. What might be going wrong?

  Thanks