OpenJDK (JDK 11) behavior discussion for HttpClient

[Asha Sunagar]

Hello Team,

We are facing invalid preface issue when we send POST request using HttpClient. We overcame this issue using workaround mentioned in openjdk issue<https://bugs.openjdk.org/browse/JDK-8198947>. The workaround was to use a blank request before making post request.

Based on our below observations, the Preface String is different in Failure & Success case,

The Preface String for
1.1) Post Request without blank request --> we get GOAWAY Exception (Failure case)

Preface String: [80, 82, 73, 32, 42, 32, 72, 84, 84, 80, 47, 50, 46, 48, 13, 10, 13, 10, 83, 77, 13, 10, 13, 10]

Preface String: [95, 70, 73, 82, 83, 84, 95, 80, 79, 83, 84, 95, 80, 77, 68, 73, 78, 72, 95, 80, 82, 73, 32, 42]

Preface String: [95, 70, 73, 82, 83, 84, 95, 80, 79, 83, 84, 95, 80, 77, 68, 73, 78, 72, 95, 80, 82, 73, 32, 42]


1.2) Workaround case with a blank request (Success Case)

Preface String: [80, 82, 73, 32, 42, 32, 72, 84, 84, 80, 47, 50, 46, 48, 13, 10, 13, 10, 83, 77, 13, 10, 13, 10]

Preface String: [80, 82, 73, 32, 42, 32, 72, 84, 84, 80, 47, 50, 46, 48, 13, 10, 13, 10, 83, 77, 13, 10, 13, 10]

Preface String: [80, 82, 73, 32, 42, 32, 72, 84, 84, 80, 47, 50, 46, 48, 13, 10, 13, 10, 83, 77, 13, 10, 13, 10]


2) LOGS
2.1) Post Request without blank request :We get the error  "an error occurred processing a frame": Failed to complete the connection preface from Liberty server and GOAWAY Exception.

[9/7/23, 15:41:10:595 IST] 00000058 id=00000000 com.ibm.ws.http.channel.h2internal.FrameReadProcessor        3 checkConnectionPreface: processNextFrame-:  stream: 0 frame type: Magic Preface  direction: READ_IN H2InboundLink hc: 101118290

[9/7/23, 15:41:10:595 IST] 00000058 id=00000000 com.ibm.ws.http.channel.h2internal.FrameReadProcessor        3 checkConnectionPreface: Preface String: [95, 70, 73, 82, 83, 84, 95, 80, 79, 83, 84, 95, 80, 77, 68, 73, 78, 72, 95, 80, 82, 73, 32, 42]

[9/7/23, 15:41:10:595 IST] 00000058 id=00000000 SystemOut                                                    O PMDINH, FrameReadProcessor CHECKPOINT 2, throw new ProtocolException --- Connection preface/magic was invalid

[9/7/23, 15:41:10:595 IST] 00000058 id=00000000 SystemOut                                                    O PMDINH, FrameReadProcessor CHECKPOINT 3, throw new ProtocolException --- Cconnection preface

[9/7/23, 15:41:10:595 IST] 00000058 id=00000000 com.ibm.ws.http.channel.h2internal.H2InboundLink             3 processRead: an error occurred processing a frame: Failed to complete the connection preface

[9/7/23, 15:41:10:595 IST] 00000058 id=00000000 com.ibm.ws.http.channel.h2internal.H2InboundLink             3 close(vc,e): :linkstatus: is: INIT :close: H2InboundLink hc: 101118290exception: com.ibm.ws.http.channel.h2internal.exceptions.ProtocolException: Failed to complete the connection preface


2.2) Workaround case with a blank request

[9/7/23, 15:54:21:528 IST] 0000005a id=00000000 com.ibm.ws.http.channel.h2internal.FrameReadProcessor        3 checkConnectionPreface: processNextFrame-:  stream: 0 frame type: Magic Preface  direction: READ_IN H2InboundLink hc: 551136004

[9/7/23, 15:54:21:528 IST] 0000005a id=00000000 com.ibm.ws.http.channel.h2internal.FrameReadProcessor        3 checkConnectionPreface: Preface String: [80, 82, 73, 32, 42, 32, 72, 84, 84, 80, 47, 50, 46, 48, 13, 10, 13, 10, 83, 77, 13, 10, 13, 10]

[9/7/23, 15:54:21:528 IST] 0000005a id=00000000 com.ibm.ws.http.channel.h2internal.H2InboundLink             3 createNewInboundLink entry: stream-id: 0

[9/7/23, 15:54:21:528 IST] 0000005a id=00000000 com.ibm.ws.http.channel.internal.inbound.HttpInboundLink



Please let us to know whether it is an expected behavior or an issue?  Or is there a way to handle such scenarios?



Thanks & Regards,

Asha H Sunagar

IGA - JTC | Global Business Services - IBM

Phone: +91 8884256034

Email : asha.sunagar at ibm.com<mailto:asha.sunagar at ibm.com>

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