nodeJS max header size in http.request

Use --max-http-header-size on the node command-line to accept larger headers. If you get "node: bad option: --max-http-header-size", upgrade to node v10.15.0 or newer. Relevant changelog

node --max-http-header-size 15000 client.js

Credit to @murad.

The HTTP protocol parser that Node uses appears to be hard-coded with a maximum header size of 8KB. Relevant constant. Since that is a compile-time constant, you would have to use a custom-compiled version of Node to set that constant larger.

It really sounds like the service you are using has made a mistake by putting that much data in a header though. Headers are meant for metadata about the request body. If they have that much data to return, they should probably be including it in the request body.

You could explore using an alternate HTTP parser like http-parser-js, since it doesn't appear to have a limit.