I am able to send logs to OpenTelemetry normally from my local javascript project (http://localhost:3000) using the below configuration:

receivers:
  otlp:
    protocols:
      http:
        cors:
          allowed_origins:
            - http://localhost:3000
          max_age: 7200
        endpoint: 0.0.0.0:4318
exporters:
  debug:
    verbosity: detailed
service:
  pipelines:
    traces:
      receivers: [otlp]
      exporters: [debug]
    metrics:
      receivers: [otlp]
      exporters: [debug]
    logs:
      receivers: [otlp]
      exporters: [debug]

Note that I am using the original collector => https://github.com/open-telemetry/opentelemetry-collector

But I am not able anymore to send logs to the collector when using https://github.com/open-telemetry/opentelemetry-collector-contrib which is a superset of the opentelemetry collector

I got

Access to resource at 'http://localhost:4318/v1/traces' from origin 'http://localhost:3000' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource.

Any ideas ?