How do you stream a large response from Spring MVC safely?

Chooses Resource, StreamingResponseBody, emitters, or SSE while controlling memory, timeout, disconnect, headers, and late failure.

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TL;DR

For file-like content, I can return a Resource or ResponseEntity<Resource> so Spring copies it to the response. StreamingResponseBody writes directly to the output stream asynchronously, while ResponseBodyEmitter and SseEmitter support multiple objects or events over time. I set the correct content type and safe content-disposition metadata and avoid reading the whole source into a byte array. The source stream is opened lazily and closed by a clear owner.

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Streaming APIs, response commitment, backpressure limits, resource ownership, and operational behavior.

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Streaming avoids buffering the entire body, but it changes failure, timeout, and resource-lifetime semantics.
For file-like content, I can return a Resource or ResponseEntity<Resource> so Spring copies it to the response. StreamingResponseBody writes directly to the output stream asynchronously, while ResponseBodyEmitter and SseEmitter support multiple objects or events over time. I set the correct content type and safe content-disposition metadata and avoid reading the whole source into a byte array. The source stream is opened lazily and closed by a clear owner.
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Details

Loading a large file into a byte array first.
Expecting late exceptions to produce Problem Details.
Using an unbounded executor for streaming writes.

How do you stream a large response from Spring MVC safely?

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