The application performs 1000+ requests to the same web api at
max 10 requests per second.
Quite often it crashes producing the trace below.
There are 10 tasks each calling `requestHTTP( url, ...` in a
loop, the loop body is guarantied never ready within a second.
Any ideas what might be causing this Assert to trigger?
The asserts checks are:
```
assert(!m_requesting, "Interleaved HTTP client requests
detected!");
assert(!m_responding, "Interleaved HTTP client request/response
detected!");
```
Stack trace:
```
[main(/cjf-fin) FATAL] TaskFiber getting terminated due to an
uncaught core.exception.AssertError:
core.exception.AssertError@C:\Users\arjan\AppData\Local\dub\packages\vibe-http\1.2.1\vibe-http\source\vibe\http\client.d(642): Interleaved HTTP client request/response detected!
[main(/cjf-fin) FATAL] ----------------
[main(/cjf-fin) FATAL] 0x00007FF7FB505F1A in d_assert_msg
[main(/cjf-fin) FATAL] 0x00007FF7FB3B4130 in
vibe.http.client.HTTPClient.doRequest at
C:\Users\arjan\AppData\Local\dub\packages\vibe-http\1.2.1\vibe-http\source\vibe\http\client.d(641)
[main(/cjf-fin) FATAL] 0x00007FF7FB3B1929 in
vibe.http.client.HTTPClient.doRequestWithRetry at
C:\Users\arjan\AppData\Local\dub\packages\vibe-http\1.2.1\vibe-http\source\vibe\http\client.d(631)
[main(/cjf-fin) FATAL] 0x00007FF7FB3AF8D8 in
vibe.http.client.HTTPClient.request at
C:\Users\arjan\AppData\Local\dub\packages\vibe-http\1.2.1\vibe-http\source\vibe\http\client.d(602)
[main(/cjf-fin) FATAL] 0x00007FF7FB3AF4AA in
vibe.http.client.requestHTTP at
C:\Users\arjan\AppData\Local\dub\packages\vibe-http\1.2.1\vibe-http\source\vibe\http\client.d(81)
[main(/cjf-fin) FATAL] 0x00007FF7FB3AF34E in
vibe.http.client.requestHTTP at
C:\Users\arjan\AppData\Local\dub\packages\vibe-http\1.2.1\vibe-http\source\vibe\http\client.d(75)
```
