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Possible bug with multiple fetch? - kwikman - 04-29-2021


I sit on a windows 10 machine.
I am doing multiple 'basic' get with '|acc_time' in Postman and using curl. Works fine every time.

But when i use Node.Js ( tested the following: node-fetch, axios, native etc) and in the same code (with proper async/await) hit the same url multiple times ( also tried with 5sec delay), the first request goes ok, the second and so on error with ECONNRESET. 

I have also tested similar setting with C#/Java. Similar story ( little different error messages but deep down there socket hang up :-)

I can do multiple accX=full requests and so on without error. I have looked at the master branch for the Java remote server and cant see any specific reason.

Please, tell me that i am missing something obvious :-)

Best regards

RE: Possible bug with multiple fetch? - Sebastian Staacks - 04-29-2021

Sounds odd. Since the main difference seems to be that you are using properly threaded code in your non-working example, I could imagine that your code is running too efficient. A thing to know about the web server implementation in phyphox is that it is not multi-threaded. This in particular means that the phyphox web server will not handle any request until the previous connection has been closed. On most simple implementations this is not a problem and typical parallel requests from webbrowsers are patient and wait until their requests are being handled.

So, my first theory would be that your proper implementation sends a request just when the last one has been closed but before the poor phone had the time to open back up for business. Just a first thought, but without aby node.js experience or the code I cannot really say more... On the other hand it is weird that the full requests come through just fine.

RE: Possible bug with multiple fetch? - kwikman - 04-29-2021

Hello again

And thanx for the fast response! Yes it could be something like that, first i suspected that i was doing something wrong in node.js, therefore i tested with the other language.

Yes 2, the full request works, even in loop upto 5 times. Havent tested with more. I have to investigate some more, at least i now know that i am on the track at least.

Students by the way like you product, it's a great way to make them program/do datahandling/timeseries/fft and so on with real data :-) So keep up the good work.

Best regards