Method GET Fails After Several Requests

Posted on Tue 11th, April 2017

• #1

Hello Everyone,

I was in the process of adapting some code from

http://forum.espruino.com/conversations/301910/

to test out writing using fs.pipe() on Espruino/8266 to the new file system enhancement. And I came across a strange problem -- at least for me. I may not be coding it right, and or it maybe a known problem I'm not aware of, though its happened on two boards now. So I thought I'd share it with you to get your feedback.

Basically with this code:

var http = require("http");
var wifi=require("Wifi");
var esp8266=require("ESP8266"); // for esp8266.printLog()

var page = "<html><head><title>test pipe</title><script src=\"https://ajax.googleapis.com/ajax/libs/jquery/2.1.4/jquery.min.js\"></script></head><body><button id=\"getPage\">Reload Page</button><textarea rows=\"5\" cols=\"100\" id=\"Htmlfile\"></textarea></body><script>$(\"#getPage\").click(function(){$.get(\"/getPage\",function(data){$(\"#Htmlfile\").val(data);})});</script></html>";

function handleGet(req,res) {
  console.log("handleGet() -> req");
  console.log(req);
  
  if (req.url=="/getPage" || req.url== "/") {
    
    res.writeHead(200,{"Content-Type":"text/html"});
    res.end(page);
    
  } else {
    res.writeHead(404);
    res.end("404 Not Found");
   }
}

function onPageRequest(req,res) {
    console.log("onPageRequest() -> req");
    console.log(req);
 
    if(req.method == 'GET') 
       handleGet(req,res);
    //else req.connection.destroy();
  
}

E.on("init", function () {
      wifi.connect(wifi.getDetails().ssid, {password: wifi.getDetails().password}, function(err) {
          if (err) {
            console.log("Connection error: "+err);
            return;
          }
          console.log("Connected!");
          console.log(wifi.getIP());
          server = http.createServer(onPageRequest);
 server.listen(80);
        });
});

After 7 to 9 sequential requests spaced by a few seconds (ie: pressing the button in the example), I would get a failure status in Chrome's developer tools and of course no data would be returned, as shown in the included screenshot. I was doing this manually (pressing the button), and made sure to wait until the requests had completed in the browser. If I pressed RELOAD in the browser (not the button in the html page), the 8266 would also fail to send anything, though interestingly it was still seeing the requests, as they would be "consoled" properly. Just nothing was returned.

If I waited 5 minutes or so, I could do it again another 7-9 times then it would fail. I suppose it could be a fun game if I had been drinking, but this was not the case. :) And I suppose the more practically minded of you would tell me just not to press it so often :P

By including this line:

memoryInterval=setInterval(function() {console.log(process.memory());},1000);

I could see easily that free memory almost always stayed between around 1400-1513.

{ "free": 1513, "usage": 187, "total": 1700, "history": 105 }

After each failure esp8266.printLog shows something like this:

>esp8266.printLog()
70, heap: 2592
793824> espconn_tcp_delete 1, 80
794217> > jshReset
794218> < jshReset
807169> E:M 416
816078> E:M 416
817512> E:M 416
818945> E:M 416
820081> E:M 416
840002> Thu Jan 01 00:14:00 1970, heap: 1376
900002> Thu Jan 01 00:15:00 1970, heap: 1376
=undefined

and another time:

>esp8266.printLog()
2> E:M 656
 43382> E:M 656
 43382> E:M 656
 43382> E:M 656
 43382> E:M 656
 43382> E:M 656
 43383> E:M 656
 45902> E:M 656
 45902> E:M 656
 45902> E:M 656
 45903> E:M 656
 45903> E:M 656
 45903> E:M 656
 45903> E:M 656
 45903> E:M 656
 45903> E:M 656
=undefined

So my first question is have I done anything visible wrong in my code? And then if not, can anyone replicate this? Or have any other ideas?

For what its worth, I have a few ESP8266s talking to each other (so 2-4) in another project, so we could imagine that this scenario would occur if some of the units made some requests quickly in sequence. So its something that could be seen "live" somewhere outside of this example, at least for me.

Thanks :)
-hfc

BTW: I'm using 1v91.741.

1 Attachment

• #2

Wilberforce

I think you are running out of heap - E:M 656 I seem to recall is a failed memory allocation.

I ran your code on the ESP32. I clicked the button on the browser as quick as could - no fails... and it responded within 124-197 ms for the request.
• #3

Wilberforce

Some of the builds reduce the jsvars from 1700 to 1600 to give more heap - perhaps you should try that.
• #4

hungryforcodes

Ah, OK thanks -- I will do that :)
• #5

MaBe

Hi @hungryforcodes,

please check this https://github.com/espruino/Espruino/issues/809#issuecomment-249232460

You are running out of heap memory.
• #6

hungryforcodes

@MaBe Hello! This was a great link and very informative, thank you :) I'll see what I can do on my side to mitigate the effect. :)

Post a reply
- Bold
- Italics
- Link
- Image
- List
- Quote
- code
- Preview
Formatting Help

Don't worry about formatting, just type in the text and we'll take care of making sense of it. We will auto-convert links, and if you put asterisks around words we will make them bold.

Tips:

Create headers by underlining text with ==== or ----

To *italicise* text put one asterisk each side of the word

To **bold** text put two asterisks each side of the word

Embed images by entering:
![](https://www.google.co.uk/images/srpr/logo4w.png)
That's the hard one: exclamation, square brackets and then the URL to the image in brackets.

* Create lists by starting lines with asterisks

1. Create numbered lists by starting lines with a number and a dot

> Quote text by starting lines with >

Mention another user by @username

For syntax highlighting, surround the code block with three backticks:

```
Your code goes here
```
Just like Github, a blank line must precede a code block.

If you upload more than 5 files we will display all attachments as thumbnails.

For a full reference visit the Markdown syntax.

Method GET Fails After Several Requests

About