Envoy is a high-performance, open-source edge and service proxy designed for cloud-native applications. It acts as a communication bus and universal data plane designed for large microservice architectures. Envoy provides advanced load balancing, observability, and security features, making it a popular choice for managing service-to-service communication.
When using Envoy, you might encounter a 'Protocol Version Mismatch' error. This issue typically manifests as failed connections or unexpected behavior when Envoy attempts to communicate with a client or server using an incompatible protocol version.
Some common error messages associated with this issue include:
upstream connect error or disconnect/reset before headersprotocol error: unsupported protocol versionThe 'Protocol Version Mismatch' occurs when there is a discrepancy between the protocol versions supported by Envoy and those supported by the client or server it is communicating with. This can happen if one side is using HTTP/1.1 while the other expects HTTP/2, or if there are differences in TLS versions.
This issue often arises due to misconfigurations or when upgrading components without ensuring compatibility. It is crucial to ensure that both sides of the communication channel support the same protocol versions.
Resolving this issue involves verifying and aligning the protocol versions on both sides of the communication.
Check the protocol versions supported by both Envoy and the client/server. You can do this by reviewing the configuration files or using command-line tools. For example, use curl to check HTTP versions:
curl -I --http2 https://example.com
Ensure that Envoy's configuration aligns with the protocol versions supported by the client/server. Update the envoy.yaml configuration file to specify the correct protocol versions. For example, to enable HTTP/2, include:
http2_protocol_options: {}
After updating configurations, restart Envoy and the client/server to apply the changes. Use the following command to restart Envoy:
sudo systemctl restart envoy
For more information on configuring Envoy, refer to the Envoy Documentation. Additionally, the HTTP/2 Configuration Guide provides detailed instructions on enabling HTTP/2 support.
By following these steps, you can resolve the 'Protocol Version Mismatch' issue and ensure seamless communication between Envoy and your services.
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