getting the reason why websockets closed with close code 1006

Question

I would like to get the reason websockets closed  so I can show the right message to the user   I have  sok onerror function  evt           since there is an error  sockets will close so           sok onclose function e              console log  WebSocket Error      e      The code is always 1006 and the reason is always      But I want to tell different closing reasons apart   For example the comand line gives an error reason    you cannot delete that  because database wont let you   But on Chrome s console  the reason is still        Any other way to tell different closing reasons apart

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In my and possibly  BIOHAZARD case it was nginx proxy timeout  In default it s 60 sec without activity in socket  I changed it to 24h in nginx and it resolved problem  proxy read timeout 86400s  proxy send timeout 86400s

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Thought this might be handy for others  Knowing regex is useful  kids  Stay in school   Edit  Turned it into a handy dandy function   let specificStatusCodeMappings          1000    Normal Closure        1001    Going Away        1002    Protocol Error        1003    Unsupported Data        1004     For future         1005    No Status Received        1006    Abnormal Closure        1007    Invalid frame payload data        1008    Policy Violation        1009    Message too big        1010    Missing Extension        1011    Internal Error        1012    Service Restart        1013    Try Again Later        1014    Bad Gateway        1015    TLS Handshake      function getStatusCodeString code        if  code  gt   0  amp  amp  code  lt   999            return   Unused          else if  code  gt   1016            if  code  lt   1999                return   For WebSocket standard              else if  code  lt   2999                return   For WebSocket extensions              else if  code  lt   3999                return   For libraries and frameworks              else if  code  lt   4999                return   For applications                        if  typeof specificStatusCodeMappings code        undefined             return specificStatusCodeMappings code             return   Unknown        Usage   getStatusCodeString 1006      Abnormal Closure             0-999     Unused         1016-1999     For WebSocket standard         2000-2999     For WebSocket extensions         3000-3999     For libraries and frameworks         4000-4999     For applications             1000    Normal Closure        1001    Going Away        1002    Protocol Error        1003    Unsupported Data        1004     For future         1005    No Status Received        1006    Abnormal Closure        1007    Invalid frame payload data        1008    Policy Violation        1009    Message too big        1010    Missing Extension        1011    Internal Error        1012    Service Restart        1013    Try Again Later        1014    Bad Gateway        1015    TLS Handshake      Source  with minor edits for terseness   https   developer mozilla org en-US docs Web API CloseEvent Status codes

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It looks like this is the case when Chrome is not compliant with WebSocket standard  When the server initiates close and sends close frame to a client  Chrome considers this to be an error and reports it to JS side with code 1006 and no reason message  In my tests  Chrome never responds to server-initiated close frames  close code 1000  suggesting that code 1006 probably means that Chrome is reporting its own internal error   P S  Firefox v57 00 handles this case properly and successfully delivers server s reason message to JS side

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This may be your websocket URL you are using in device are not same You are hitting different websocket URL from android iphonedevice

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I ve got the error while using Chrome as client and golang gorilla websocket as server under nginx proxy  And sending just some  ping  message from server to client every x second resolved problem

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Close Code 1006 is a special code that means the connection was closed abnormally  locally  by the browser implementation   If your browser client reports close code 1006  then you should be looking at the websocket onerror evt  event for details   However   Chrome will rarely report any close code 1006 reasons to the Javascript side  This is likely due to client security rules in the WebSocket spec to prevent abusing WebSocket   such as using it to scan for open ports on a destination server  or for generating lots of connections for a denial-of-service attack    Note that Chrome will often report a close code 1006 if there is an error during the HTTP Upgrade to Websocket  this is the step before a WebSocket is technically  connected     For reasons such as bad authentication or authorization  or bad protocol use  such as requesting a subprotocol  but the server itself doesn t support that same subprotocol   or even an attempt at talking to a server location that isn t a WebSocket  such as attempting to connect to ws   images google com    Fundamentally  if you see a close code 1006  you have a very low level error with WebSocket itself  similar to  Unable to Open File  or  Socket Error    not really meant for the user  as it points to a low level issue with your code and implementation   Fix your low level issues  and then when you are connected  you can then include more reasonable error codes   You can accomplish this in terms of scope or severity in your project   Example  info and warning level are part of your project s specific protocol  and don t cause the connection to terminate   With severe or fatal messages reporting also using your project s protocol to convey as much detail as you want  and then closing the connection using the limited abilities of the WebSocket close flow   Be aware that WebSocket close codes are very strictly defined  and the close reason phrase message cannot exceed 123 characters in length  this is an intentional WebSocket limitation    But not all is lost  if you are just wanting this information for debugging reasons  the detail of the closure  and its underlying reason is often reported with a fair amount of detail in Chrome s Javascript console

[javascript] getting the reason why websockets closed with close code 1006

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