Hi All/Oleg, Greetings everyone! I trust you are all doing well. We've been utilizing httpcore5-h2 (version 5.2.2), and unfortunately, we encountered an issue in our production environment yesterday. Upon investigation of the library code, it appears that the problem lies within the library.
The Issue: HTTP calls to send a file larger than 16KB are failing due to an error stating, "Frame size exceeds maximum." Background: Our server is accessed behind an Application Load Balancer (ALB). We previously faced an issue where the frame size was set to 16MB, as dictated by the remote configuration, leading to memory problems. This particular issue was addressed in a previous resolution: https://issues.apache.org/jira/browse/HTTPCORE-751. In that resolution, we agreed to use a smaller frame size, expecting that the server would not send frames larger than the specified size. I believe that the current issue may be a regression resulting from the changes implemented in https://issues.apache.org/jira/browse/HTTPCORE-751. [image: image.png] if you look at the code highlighted above in AbstractH2StreamMultiplexer class, it should be final int maxPayloadSize = Math.min(capacity, localConfig.getMaxFrameSize()); because we have set it value between the minimum of both server and local config otherwise payload can exceed the outBuffer size which is happening in our case. Traces Of the issues: java.lang.IllegalArgumentException: Frame size exceeds maximum at org.apache.hc.core5.util.Args.check(Args.java:41) at org.apache.hc.core5.http2.impl.nio.FrameOutputBuffer.write(FrameOutputBuffer.java:98) at org.apache.hc.core5.http2.impl.nio.AbstractH2StreamMultiplexer.streamDataFrame(AbstractH2StreamMultiplexer.java:340) at org.apache.hc.core5.http2.impl.nio.AbstractH2StreamMultiplexer.streamData(AbstractH2StreamMultiplexer.java:361) at org.apache.hc.core5.http2.impl.nio.AbstractH2StreamMultiplexer.access$1300(AbstractH2StreamMultiplexer.java:92) at org.apache.hc.core5.http2.impl.nio.AbstractH2StreamMultiplexer$H2StreamChannelImpl.write(AbstractH2StreamMultiplexer.java:1709) at org.apache.hc.core5.http2.impl.nio.ClientH2StreamHandler$1.write(ClientH2StreamHandler.java:92) at org.apache.hc.client5.http.impl.async.HttpAsyncMainClientExec$1$1.write(HttpAsyncMainClientExec.java:172) at org.apache.hc.core5.http.nio.entity.BasicAsyncEntityProducer.produce(BasicAsyncEntityProducer.java:129) at org.apache.hc.core5.http.nio.support.BasicRequestProducer.produce(BasicRequestProducer.java:104) at com.iontrading.treasuryportal.core.bindingshelper.producers.TARequestProducer.produce(TARequestProducer.java:52) at org.apache.hc.client5.http.impl.async.InternalAbstractHttpAsyncClient$2.produce(InternalAbstractHttpAsyncClient.java:260) at org.apache.hc.client5.http.impl.async.HttpAsyncMainClientExec$1.produce(HttpAsyncMainClientExec.java:163) at org.apache.hc.core5.http2.impl.nio.ClientH2StreamHandler.produceOutput(ClientH2StreamHandler.java:172) at org.apache.hc.core5.http2.impl.nio.AbstractH2StreamMultiplexer$H2Stream.produceOutput(AbstractH2StreamMultiplexer.java:1539) at org.apache.hc.core5.http2.impl.nio.AbstractH2StreamMultiplexer.produceOutput(AbstractH2StreamMultiplexer.java:1266) at org.apache.hc.core5.http2.impl.nio.AbstractH2StreamMultiplexer.onOutput(AbstractH2StreamMultiplexer.java:474) at org.apache.hc.core5.http2.impl.nio.AbstractH2IOEventHandler.outputReady(AbstractH2IOEventHandler.java:74) at org.apache.hc.core5.http2.impl.nio.ClientH2IOEventHandler.outputReady(ClientH2IOEventHandler.java:39) Thanks, Sandeep Gaur
