URL Session randomly returns requests extremely slowly!

Question

Created 2d

Replies 4

Boosts 0

Participants 2

Hi,

I'm experiencing intermittent delays with URLSession where requests take 3-4 seconds to be sent, even though the actual server processing is fast. This happens randomly, maybe 10-20% of requests.

The pattern I've noticed is

I create my request
I send off my request using try await urlSession.data(for: request)
My middleware ends up receiving this request 4-7s after its been fired from the client-side
The round trip ends up taking 4-7s!

This hasn't been reproducible consistently at all on my end. I've also tried ephemeral URLSessions (so recreating the session instead of using .shared so no dead connections, but this doesn't seem to help at all)

Completely lost on what to do. Please help!

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Answer 1

DTS Engineer OP

Apple

2d

You wrote:

This happens randomly, maybe 10-20% of requests.

and also:

This hasn't been reproducible consistently at all on my end.

which has left me somewhat confused as to whether you can reproduce this in your office or not. Please clarify.

Share and Enjoy
—
Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"

0

Answer 2

LawrenceLiu OP

2d

Hey Quinn,

Nope - I haven't been able to reproduce consistently. It comes and goes every couple hours, but there's no specific scenario / condition / environment that I've found to reproduce this 1 for 1.

But what I have noticed is while using my application, occasionally these requests slow down a ton. I've heard this from countless other customers as well.

0

Answer 3

LawrenceLiu OP

2d

I'm happy to share mini-repos to reproduce the error in DMs or something - this problem has been bugging us for the past 3 weeks and we can't figure it out.

0

Answer 4

DTS Engineer OP

Apple

1d

Is this on iOS?

If so, do you ever see it on the simulator?

Or if you run your iOS app on the Mac?

Share and Enjoy
—
Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"

0