ok2c commented on PR #709:
URL:
https://github.com/apache/httpcomponents-client/pull/709#issuecomment-3219881134
@rschmitt I believe I have found the underlying cause of the problem (or
misunderstanding if you agree to see it that way)
Here is the thing. The HTTP/1.1 by default aggressively pipeline request
messages. What that basically means the client can write out n requests before
the server gets to process the first once and drop the connection.
```
exchange 1: POST /ping
exchange 1: stale-check (success)
exchange 2: POST /ping
exchange 2: stale-check (success)
exchange 3: POST /ping
exchange 3: stale-check (success)
exchange 1: 200 OK
exchange 1: server closes connection
exchange 2: boom
exchange 3: boom
```
The stale connection check cannot help when pipelining is being employed
because the connection is perfectly valid at the time of request initiation.
The H2 tests do not exhibit this problem because the server limits the
number of concurrent streams to 1
```
out.write(ff.createSettings(
...
new H2Setting(H2Param.MAX_CONCURRENT_STREAMS, 1),
...
), outputStream);
```
I do not know if this is intentional or not but with the message pipelining
not used, I get 100% reliability of message exchanges with both HTTP/1.1 and H2
using code with slight modifications to ensure HTTP/1.1 get executed
sequentially
```
h2: Validation disabled: Sequential requests (slow): 10 succeeded; 0 failed
(100.00% success rate)
h2: Validation enabled: Sequential requests (slow): 10 succeeded; 0 failed
(100.00% success rate)
h2: Validation disabled: Sequential requests (rapid): 199 succeeded; 1
failed (99.50% success rate, 0.50% retriable)
h2: Validation enabled: Sequential requests (rapid): 200 succeeded; 0
failed (100.00% success rate)
h2: Validation disabled: Single large batch: 30 succeeded; 0 failed (100.00%
success rate)
h2: Validation enabled: Single large batch: 30 succeeded; 0 failed (100.00%
success rate)
h2: Validation disabled: Multiple small batches: 15 succeeded; 0 failed
(100.00% success rate)
h2: Validation enabled: Multiple small batches: 15 succeeded; 0 failed
(100.00% success rate)
h2c: Validation disabled: Sequential requests (slow): 10 succeeded; 0 failed
(100.00% success rate)
h2c: Validation enabled: Sequential requests (slow): 10 succeeded; 0 failed
(100.00% success rate)
h2c: Validation disabled: Sequential requests (rapid): 200 succeeded; 0
failed (100.00% success rate)
h2c: Validation enabled: Sequential requests (rapid): 200 succeeded; 0
failed (100.00% success rate)
h2c: Validation disabled: Single large batch: 30 succeeded; 0 failed
(100.00% success rate)
h2c: Validation enabled: Single large batch: 30 succeeded; 0 failed
(100.00% success rate)
h2c: Validation disabled: Multiple small batches: 15 succeeded; 0 failed
(100.00% success rate)
h2c: Validation enabled: Multiple small batches: 15 succeeded; 0 failed
(100.00% success rate)
https: Validation disabled: Sequential requests (slow): 10 succeeded; 0
failed (100.00% success rate)
https: Validation enabled: Sequential requests (slow): 10 succeeded; 0
failed (100.00% success rate)
https: Validation disabled: Sequential requests (rapid): 182 succeeded; 18
failed (91.00% success rate, 9.00% retriable)
https: Validation enabled: Sequential requests (rapid): 200 succeeded; 0
failed (100.00% success rate)
https: Validation disabled: Single large batch: 29 succeeded; 1 failed
(96.67% success rate, 3.33% retriable)
https: Validation enabled: Single large batch: 30 succeeded; 0 failed
(100.00% success rate)
https: Validation disabled: Multiple small batches: 15 succeeded; 0 failed
(100.00% success rate)
https: Validation enabled: Multiple small batches: 15 succeeded; 0 failed
(100.00% success rate)
http: Validation disabled: Sequential requests (slow): 10 succeeded; 0
failed (100.00% success rate)
http: Validation enabled: Sequential requests (slow): 10 succeeded; 0
failed (100.00% success rate)
http: Validation disabled: Sequential requests (rapid): 191 succeeded; 9
failed (95.50% success rate, 4.00% retriable)
http: Validation enabled: Sequential requests (rapid): 200 succeeded; 0
failed (100.00% success rate)
http: Validation disabled: Single large batch: 29 succeeded; 1 failed
(96.67% success rate, 0.00% retriable)
http: Validation enabled: Single large batch: 30 succeeded; 0 failed
(100.00% success rate)
http: Validation disabled: Multiple small batches: 15 succeeded; 0 failed
(100.00% success rate)
http: Validation enabled: Multiple small batches: 15 succeeded; 0 failed
(100.00% success rate)
```
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