Weird and rare WinHttpRequest error

[venaci]

I very rarely get an error (0x80072F46) saying WinHttpRequest can't call SetRequestHeader function after calling Send function. It's weird because my code looks like this:

Code: Select all

global whr := ComObjCreate("WinHttp.WinHttpRequest.5.1")

f() {
whr.Open(...)
whr.SetRequestHeader(...)
whr.Send(...)
whr.WaitForResponse(...)
...
}

Code looks completely synchronous for me and I don't know why it sometimes doesn't work (like once in a hundred requests).
Maybe it's caused by multiple f function calls? Or it's because whr is a global variable?
It's very hard to debug an error when it occurs so rare and I don't know by what circumstances it's caused. Nevertheless an error message always points the line with whr.SetRequestHeader(...) call.

[swagfag]

this code may be synchronous. ur actual script needn't be, we dont know what it looks like

Maybe it's caused by multiple f function calls?

maybe, maybe not. where is f called? who calls it? how was it called? we cant know

Or it's because whr is a global variable?

its suspect but that on its own doesnt mean much. again we cant know, show something more closely resembling an actual runnable script