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When use URLRequest, set httpMethod to GET, and set some no-empty Data to HTTPBody, is that correct that URLRequest just calculate content-length by HTTPBody.count? Because when i check RFC of HTTP, it's said that there is no-meaning of messageBody in Get request, so should it be zero when URLRequest found that HTTPMethod is Get?

2

When use URLRequest …

Are you targeting an Apple platform? Or Linux?

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Quinn “The Eskimo!” @ DTS @ Apple

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Target is Apple Platform, iOS.

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As of the 2019 OSes, URLRequests with a GET httpMethod and non-nil body data is considered an error, and URLSession will fail any task trying to perform one. Previously, URLSession didn't throw an error but also didn't set the Content-Length when performing the request, leading it to fail. Even if you manually set Content-Length, servers don't usually support GET requests with body data anyway.

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5

Thanks for your reoly.
I have some question:

What's is 2019 OSes
Is it iOS13&macOS10.15？

URLSession will fail any task trying to perform one
so URLSession will directly return error and don't send and HTTP Request to Server?

Thanks.

6

Yes, in iOS 13, macOS 10.15, etc., URLSession will immediately fail the task before sending it over the network, per Apple's release notes:

Previous versions will have a network failure error of some kind.

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7

Thanks a lot, i should read iOS release notes carefully.