Handle java.io.IOException: Broken pipe

This issue happens when the endpoints server tries to do rewriting on a large payload.

The error can be found in the Endpoints server log group in CloudWatch (ends in _Log_Group_Endpoint), and looks something like:

"errorLog": [
  {
    "errorMessage": "Could not proxy request!",
    "error": [
      "org.apache.catalina.connector.ClientAbortException: java.io.IOException: Broken pipe", // 👈
      "\tat org.apache.catalina.connector.OutputBuffer.realWriteBytes(OutputBuffer.java:341)",
      "\tat org.apache.catalina.connector.OutputBuffer.flushByteBuffer(OutputBuffer.java:776)",
...

To fix it, you can try to lower the tunneling threshold with these two parameters in configuration (these would be entries in the combine-configuration DynamoDb table):

• combine.endpoints.aws.request.tunneling.threshold
• combine.endpoints.aws.response.tunneling.threshold

The default for these is 2147483647, try setting them to 134217728.

To do this via DynamoDb, create an item and set parameter_name to combine.endpoints.aws.request.tunneling.threshold, and add an attribute for parameter_value with the value set to 134217728, shown below: