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    Interface Headers

    The Headers interface of the Fetch API allows you to perform various actions on HTTP request and response headers.

    MDN Reference

    interface Headers {
        append(name: string, value: string): void;
        delete(name: string): void;
        forEach(
            callbackfn: (value: string, key: string, parent: Headers) => void,
            thisArg?: any,
        ): void;
        get(name: string): string | null;
        getSetCookie(): string[];
        has(name: string): boolean;
        set(name: string, value: string): void;
    }
    Index
    append delete forEach get getSetCookie has set

    • The append() method of the Headers interface appends a new value onto an existing header inside a Headers object, or adds the header if it does not already exist.

      MDN Reference

      Parameters

      • name: string
      • value: string

      Returns void

    • The delete() method of the Headers interface deletes a header from the current Headers object.

      MDN Reference

      Parameters

      • name: string

      Returns void

    • Parameters

      • callbackfn: (value: string, key: string, parent: Headers) => void
      • OptionalthisArg: any

      Returns void

    • The get() method of the Headers interface returns a byte string of all the values of a header within a Headers object with a given name.

      MDN Reference

      Parameters

      • name: string

      Returns string | null

    • The getSetCookie() method of the Headers interface returns an array containing the values of all Set-Cookie headers associated with a response.

      MDN Reference

      Returns string[]

    • The has() method of the Headers interface returns a boolean stating whether a Headers object contains a certain header.

      MDN Reference

      Parameters

      • name: string

      Returns boolean

    • The set() method of the Headers interface sets a new value for an existing header inside a Headers object, or adds the header if it does not already exist.

      MDN Reference

      Parameters

      • name: string
      • value: string

      Returns void

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