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header could be empty string

Open Damian Drągowski requested to merge github/fork/damiandragowski/patch-1 into master

changing condition, do setHeader only when header is not

null undefined NaN empty string ("") 0 false

It preserve from exception:

[HPM] GET /events?uuids=18cd56cb-45cb-43e6-a397-c4531cc57866 -> http://localhost:8099 _http_outgoing.js:545 throw new ERR_INVALID_HTTP_TOKEN('Header name', name); ^

TypeError [ERR_INVALID_HTTP_TOKEN]: Header name must be a valid HTTP token [""] at ServerResponse.setHeader (_http_outgoing.js:563:3)