unexpected trailing / appended to endpoint configured via OTEL_EXPORTER_OTLP_TRACES_ENDPOINT

[codeboten]

What happened?

Steps to Reproduce

Using the example code from opentelemetry.io, I tried configuring an endpoint to send data to and was receiving 404's from my backend. After digging into it, the data was being sent to https://endpoint/something/ instead of https://endpoint/something.

Expected Result

Traces sent to https://endpoint/something

Actual Result

Traces sent to https://endpoint/something/ resulting in a 404

Additional Details

Tracked the code that does the appending here:

opentelemetry-js/experimental/packages/otlp-exporter-base/src/util.ts

Lines 60 to 63 in 6111ae0

	if (!url.includes(path) && !url.endsWith('/')) {
	url = url + '/';
	}
	return url;

Note that this problem does not occur if i configure the endpoint in the code instead.

OpenTelemetry Setup Code

const opentelemetry = require("@opentelemetry/sdk-node");
const { getNodeAutoInstrumentations } = require("@opentelemetry/auto-instrumentations-node");
const { diag, DiagConsoleLogger, DiagLogLevel } = require('@opentelemetry/api');
diag.setLogger(new DiagConsoleLogger(), DiagLogLevel.DEBUG);
const {
  OTLPTraceExporter,
} = require("@opentelemetry/exporter-trace-otlp-http");

const sdk = new opentelemetry.NodeSDK({
  traceExporter: new OTLPTraceExporter(),
  instrumentations: [getNodeAutoInstrumentations()],
});
sdk.start();

package.json

No response

Relevant log output

No response

[pichlermarc]

Thank you for pointing this out. I'll pick this up ASAP. 🙂