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Streaming is now enabled by default for all Vercel Functions running on Node.js for Pro and Enterprise teams, marking the final step in the plan we published on July 8th, 2024. This means Vercel Functions can now send data to the client as it’s generated, instead of waiting for the entire response.
The VERCEL_FORCE_NODEJS_STREAMING environment variable is no longer required—streaming is now applied automatically upon deployment.
Logging changes: Streaming responses will alter the format and frequency of your runtime logs. If you are using Log Drains, check that your ingestion pipeline can process the new log format and increased log frequency.
Read our blog post and documentation for more information.