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+--- Thread: Possible bug with multiple fetch? (/showthread.php?tid=1344)
Possible bug with multiple fetch? - kwikman - 04-29-2021
Hello
I sit on a windows 10 machine.
I am doing multiple 'basic' get with 'http://192.168.0.5:8080/get?acc_time=0.41327542&accX=0.41327542|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
Kaj
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
Kaj