Variable appears to be in bytes not kilobytes. I got the following error assuming kilobytes:
SvelteKitError: Content-length of 4870507 exceeds limit of 30000 bytes.
at Object.start (file:///app/build/handler.js:984:19)
at setupReadableStreamDefaultController (node:internal/webstreams/readablestream:2333:23)
at setupReadableStreamDefaultControllerFromSource (node:internal/webstreams/readablestream:2366:3)
at new ReadableStream (node:internal/webstreams/readablestream:289:7)
at get_raw_body (file:///app/build/handler.js:973:9)
at getRequest (file:///app/build/handler.js:1054:7)
at Array.ssr (file:///app/build/handler.js:1248:19)
at handle (file:///app/build/handler.js:1318:23)
at file:///app/build/handler.js:1318:40
at Array.<anonymous> (file:///app/build/handler.js:1237:4) {
status: 413,
text: 'Payload Too Large'
}