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[OTLP] Set TE header for gRPC calls (#6449)

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Martin Costello 2025-08-22 16:39:37 +01:00 committed by GitHub
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commit 7a4643a829
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4
src/OpenTelemetry.Exporter.OpenTelemetryProtocol/CHANGELOG.md
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@ -19,6 +19,10 @@ Notes](../../RELEASENOTES.md).
Note that exporting `logrecord.event.id` is still behind that same feature Note that exporting `logrecord.event.id` is still behind that same feature
flag. ([#6306](https://github.com/open-telemetry/opentelemetry-dotnet/pull/6306)) flag. ([#6306](https://github.com/open-telemetry/opentelemetry-dotnet/pull/6306))
* gRPC calls to export traces, logs, and metrics using `OtlpExportProtocol.Grpc`
now set the `TE=trailers` HTTP request header to improve interoperability.
([#6449](https://github.com/open-telemetry/opentelemetry-dotnet/pull/6449))
## 1.12.0 ## 1.12.0
Released 2025-Apr-29 Released 2025-Apr-29

5
src/OpenTelemetry.Exporter.OpenTelemetryProtocol/Implementation/ExportClient/OtlpGrpcExportClient.cs
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@ -39,6 +39,11 @@ internal sealed class OtlpGrpcExportClient : OtlpExportClient
try try
{ {
using var httpRequest = this.CreateHttpRequest(buffer, contentLength); using var httpRequest = this.CreateHttpRequest(buffer, contentLength);
// TE is required by some servers, e.g. C Core.
// A missing TE header results in servers aborting the gRPC call.
httpRequest.Headers.TryAddWithoutValidation("TE", "trailers");
using var httpResponse = this.SendHttpRequest(httpRequest, cancellationToken); using var httpResponse = this.SendHttpRequest(httpRequest, cancellationToken);
httpResponse.EnsureSuccessStatusCode(); httpResponse.EnsureSuccessStatusCode();