javascript - Are browsers supposed to repeat a request if there is no server response after a while? -

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i have opened asked question on sails project, might not related sails @ -- maybe related node.js, express.js or own code, wonder if has ever experienced this:

i have noticed browser requests "replayed" on server. in order test it, did this:

created simple controller action prints "this request" on server -- nothing else: doesn't send response browser.

when hit route, server console prints "this request", expected. keep waiting. browser keeps looping. after 2.5 minutes, "this request" printed again on server. expected behavior?

worst:

reload server. hit route. "this request" printed on console. ctrl+c server shut down , right away sails lift again while browser still looping. browser stop, , right after server lifted.... "this request" printed on console.

more info: using sails sockets-io , code has "reconnect" function:

        io.socket.on('disconnect', function(){         socketcleanup();         io.socket.on('connect', function(){             socketconnect();         });     });

this used re-subscribe user socket special rooms ( io.socket.post(socketrooms... ) don't think responsible these "replays".

if of above not expected behavior, possible that, after upload cancelled, there trying replay upload, causing server crash?

i running sails on windows 7.

something never knew:

node.js page refresh calling resources twice?

could caused favicon???

it seems there known bug chrome regarding favicons causing duplicate requests: https://bugs.chromium.org/p/chromium/issues/detail?id=64810

however, doesn't seem related, since second request here happening 2.5 minutes later. have tested firefox , ie 9 , issue valid there.


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