Frequency that I am seeing this in production:
```
21:59:38 e10:/home/y/logs/trafficserver$ grep bcall diags.log
[Sep 10 20:23:40.450] {0x2ac729347700} ERROR: bcall - received HEADERS frame on
closed stream
[Sep 10 20:40:53.813] {0x2ac72bd74700} ERROR: bcall - received HEADERS frame on
closed stream
[Sep 10 20:51:25.193] {0x2ac72a8ce700} ERROR: bcall - received HEADERS frame on
closed stream
[Sep 10 21:07:16.042] {0x2ac72a68a700} ERROR: bcall - received HEADERS frame on
closed stream
[Sep 10 21:18:06.846] {0x2ac729e5b700} ERROR: bcall - received HEADERS frame on
closed stream
[Sep 10 21:29:37.729] {0x2ac72b3a2700} ERROR: bcall - received HEADERS frame on
closed stream
[Sep 10 21:52:32.162] {0x2ac72b1ff700} ERROR: bcall - received HEADERS frame on
closed stream
```
[ Full content available at: https://github.com/apache/trafficserver/pull/4225 ]
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