The request was not processed and can be safely retried

Hi,

All of a sudden we're receiving the error "The request was not processed and can be safely retried.". Until now, everything worked perfectly.

Anybody got an idea of what the error means?

Info

Php 8.1.10
Apache/2.4.54
OpenSSL 1.1.1s

Code:

\Amp\Loop::run(
    function () {
        $handshake = new \Amp\Websocket\Client\Handshake('wss://...');

        while (true) {
            try {
                $connection = yield connect($handshake);

                yield $connection->send(json_encode([...subscription_info...]));

                while ($message = yield $connection->receive()) {
                    // ...
                }
            } catch (Exception $e) {
                // ...
            }
        }
    }
);

Stack trace:

Error reads: The request was not processed and can be safely retried.

Trace: #0 [internal function]: Amp\Http\Client\Connection\DefaultConnectionFactory->Amp\Http\Client\Connection\{closure}()
#1 ../vendor/amphp/amp/lib/Coroutine.php(115): Generator->throw(Object(Amp\Socket\TlsException))
#2 ../vendor/amphp/amp/lib/Failure.php(33): Amp\Coroutine->Amp\{closure}(Object(Amp\Socket\TlsException), NULL)
#3 ../vendor/amphp/amp/lib/Internal/Placeholder.php(143): Amp\Failure->onResolve(Object(Closure))
#4 ../vendor/amphp/amp/lib/Internal/Placeholder.php(177): Amp\Coroutine->resolve(Object(Amp\Failure))
#5 ../vendor/amphp/amp/lib/Coroutine.php(137): Amp\Coroutine->fail(Object(Amp\Socket\TlsException))
#6 ../vendor/amphp/amp/lib/Failure.php(33): Amp\Coroutine->Amp\{closure}(Object(Amp\Socket\TlsException), NULL)
#7 ../vendor/amphp/amp/lib/Internal/Placeholder.php(143): Amp\Failure->onResolve(Object(Closure))
#8 ../vendor/amphp/amp/lib/Internal/Placeholder.php(177): Amp\Promise@anonymous->resolve(Object(Amp\Failure))
#9 ../vendor/amphp/amp/lib/Deferred.php(66): Amp\Promise@anonymous->fail(Object(Amp\Socket\TlsException))
#10 ../vendor/amphp/socket/src/Internal/functions.php(148): Amp\Deferred->fail(Object(Amp\Socket\TlsException))
#11 ../vendor/amphp/amp/lib/Loop/NativeDriver.php(327): Amp\Socket\Internal\{closure}('ac', Resource id #1219, Object(Amp\Deferred))
#12 ../vendor/amphp/amp/lib/Loop/NativeDriver.php(127): Amp\Loop\NativeDriver->selectStreams(Array, Array, 4.625)
#13 ../vendor/amphp/amp/lib/Loop/Driver.php(138): Amp\Loop\NativeDriver->dispatch(true)
#14 ../vendor/amphp/amp/lib/Loop/Driver.php(72): Amp\Loop\Driver->tick()
#15 ../vendor/amphp/amp/lib/Loop.php(95): Amp\Loop\Driver->run()
...

amphp / websocket-client

The request was not processed and can be safely retried #43