Cypress crashing with ERR_HTTP_INVALID_STATUS_CODE error

[kdowney86]

Hi,

I am seeing an issue where Cypress is sometimes crashing with a ERR_HTTP_INVALID_STATUS_CODE error:

RangeError [ERR_HTTP_INVALID_STATUS_CODE] [ERR_HTTP_INVALID_STATUS_CODE]: Invalid status code: 0 at ServerResponse.writeHead (_http_server.js:255:11) at ServerResponse.writeHead (/main/cypress_bin/7.6.0/Cypress/resources/app/packages/server/node_modules/on-headers/index.js:44:26) at ServerResponse._implicitHeader (_http_server.js:246:8) at ServerResponse.end (/main/cypress_bin/7.6.0/Cypress/resources/app/packages/server/node_modules/compression/index.js:103:14) at Duplexify.onend (/main/cypress_bin/7.6.0/Cypress/resources/app/packages/server/node_modules/duplexify/node_modules/readable-stream/lib/_stream_readable.js:646:10) at Object.onceWrapper (events.js:421:28) at Duplexify.emit (events.js:315:20) at endReadableNT (/main/cypress_bin/7.6.0/Cypress/resources/app/packages/server/node_modules/duplexify/node_modules/readable-stream/lib/_stream_readable.js:1094:12) at processTicksAndRejections (internal/process/task_queues.js:80:21) { code: 'ERR_HTTP_INVALID_STATUS_CODE' } RangeError [ERR_HTTP_INVALID_STATUS_CODE] [ERR_HTTP_INVALID_STATUS_CODE]: Invalid status code: 0 at ServerResponse.writeHead (_http_server.js:255:11) at ServerResponse.writeHead (/main/cypress_bin/7.6.0/Cypress/resources/app/packages/server/node_modules/on-headers/index.js:44:26) at ServerResponse._implicitHeader (_http_server.js:246:8) at ServerResponse.end (/main/cypress_bin/7.6.0/Cypress/resources/app/packages/server/node_modules/compression/index.js:103:14) at Duplexify.onend (/main/cypress_bin/7.6.0/Cypress/resources/app/packages/server/node_modules/duplexify/node_modules/readable-stream/lib/_stream_readable.js:646:10) at Object.onceWrapper (events.js:421:28) at Duplexify.emit (events.js:315:20) at endReadableNT (/main/cypress_bin/7.6.0/Cypress/resources/app/packages/server/node_modules/duplexify/node_modules/readable-stream/lib/_stream_readable.js:1094:12) at processTicksAndRejections (internal/process/task_queues.js:80:21)

I enabled debug logging and can see that a request that the application under test is making sometimes receives a status code of 0. We then see "cypress:server:browsers killing browser process" and the test run stops.

Is there any way we can handle this 0 status code gracefully without the tests crashing?

Any advice is greatly appreciated