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ClientRequest.setHeaders method | Node.js http module | Bun

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http.ClientRequest.setHeaders { const headers = new Headers({ 'Content-Type': 'text/html' }); res.setHeaders(headers); res.writeHead(200, { 'Content-Type': 'text/plain' }); res.end('ok'); }); ```" data-algolia-static="false" data-algolia-merged="false" data-type="Method">setHeaders(headers: Headers | Mapstring, string | number | readonly string[]>): this;Sets multiple header values for implicit headers. headers must be an instance of Headers or Map, if a header already exists in the to-be-sent headers, its value will be replaced.

const headers = new Headers({ foo: 'bar' }); outgoingMessage.setHeaders(headers); or

const headers = new Map([['foo', 'bar']]); outgoingMessage.setHeaders(headers); When headers have been set with outgoingMessage.setHeaders(), they will be merged with any headers passed to response.writeHead(), with the headers passed to response.writeHead() given precedence.

// Returns content-type = text/plain const server = http.createServer((req, res) => { const headers = new Headers({ 'Content-Type': 'text/html' }); res.setHeaders(headers); res.writeHead(200, { 'Content-Type': 'text/plain' }); res.end('ok'); }); Referenced typesclass HeadersThis Fetch API interface allows you to perform various actions on HTTP request and response headers. These actions include retrieving, setting, adding to, and removing. A Headers object has an associated header list, which is initially empty and consists of zero or more name and value pairs.  You can add to this using methods like append() (see Examples.) In all methods of this interface, header names are matched by case-insensitive byte sequence.

MDN Reference

readonly count: numberGet the total number of headers

[Symbol.iterator](): HeadersIterator[string, string]>;append(name: string,value: string): void;MDN Reference

delete(name: string): void;MDN Reference

entries(): HeadersIterator[string, string]>;Returns an iterator allowing to go through all key/value pairs contained in this object.

forEach(callbackfn: (value: string, key: string, parent: Headers) => void,thisArg?: any): void;get(name: string): null | string;MDN Reference

getAll(name: 'set-cookie' | 'Set-Cookie'): string[];Get all headers matching the name

Only supports "Set-Cookie". All other headers are empty arrays.

@param nameThe header name to get

@returnsAn array of header values

const headers = new Headers(); headers.append("Set-Cookie", "foo=bar"); headers.append("Set-Cookie", "baz=qux"); headers.getAll("Set-Cookie"); // ["foo=bar", "baz=qux"] getSetCookie(): string[];MDN Reference

has(name: string): boolean;MDN Reference

keys(): HeadersIteratorstring>;Returns an iterator allowing to go through all keys of the key/value pairs contained in this object.

set(name: string,value: string): void;MDN Reference

toJSON(): Recordstring, string> & { set-cookie: string[] };Convert Headers to a plain JavaScript object.

About 10x faster than Object.fromEntries(headers.entries())

Called when you run JSON.stringify(headers)

Does not preserve insertion order. Well-known header names are lowercased. Other header names are left as-is.

values(): HeadersIteratorstring>;Returns an iterator allowing to go through all values of the key/value pairs contained in this object.

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