Updated response

[Ahsan1447]

No description provided.

[linux-foundation-easycla]

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[dmathieu]

Environment variables need to be specified before they can be used in SDKs.
https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/configuration/sdk-environment-variables.md

[kaylareopelle]

Hi @Ahsan1447, I second what @dmathieu said. Could you open an issue in https://github.com/open-telemetry/opentelemetry-specification/ to discuss adding OTEL_EXPORTER_OTLP_TRACES_CONTENT_TYPE to the specification?