angular2 async http requests

Question

May be I don't understand how async requests should work, but from my point of view 1 ajax or 10 should took almost the same time to be finished. Right now I'm facing a problem, I'm sending 3 ajax requests at the same time, and it took about 3 seconds for the first ajax, 15 seconds for the second, and 18 for the last. But if I send only first ajax - it's took 3 seconds, only second - 15 seconds, only third - 1 second. So, in other words it doesn't matter if I send 3 ajax together

this.contractService.saveContractsForOpportunity(selectedContracts).subscribe(data => {

});
this.contractService.saveContractsForOpportunity(selectedContracts).subscribe(data => {

});
this.contractService.saveContractsForOpportunity(selectedContracts).subscribe(data => {

});

Or if I send it one by one like this

this.contractService.saveContractsForOpportunity(selectedContracts).subscribe(data => {
    this.contractService.saveContractsForOpportunity(selectedContracts).subscribe(data => {
       this.contractService.saveContractsForOpportunity(selectedContracts).subscribe(data => {

       }); 
    });        
});

It tooks the same time to be finished

May be it's only about backend or server configuration?

first case total time is 18 seconds, and almost the same for the second case (18-19 seconds) — Victor Bredihin
– Victor Bredihin, Commented Jan 19, 2017 at 11:23
session_write_close is the answer on my question. PHP will lock session files for each request and maintain that lock until you do a session_write_close(). Looks like I have to put it in every php script to get it work — Victor Bredihin
– Victor Bredihin, Commented Jan 19, 2017 at 11:47

seidme · Accepted Answer · 2017-01-24 13:30:02Z

1

Most likely your problem lies on the server side. Does the server allow handling multiple requests from the same IP in parallel?

edited Jan 24, 2017 at 13:30

answered Jan 19, 2017 at 11:25

seidme

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2 Comments

Victor Bredihin Over a year ago

I'm not sure, I'm using apache2 out from the box, how can I check?

Victor Bredihin Over a year ago

I figured it out, thanks for directing me to the right way

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