fetch-http-message/dist/esm/index.js

Generate an http message string using the fetch API

import blobToString from './blobToString.js';
const hasHeaders = typeof Headers !== 'undefined';
const hasBlob = typeof Blob !== 'undefined';
const hasBuffer = typeof Buffer !== 'undefined';
const hasURLSearchParams = typeof URLSearchParams !== 'undefined';
function isRequest(object) {
    return typeof object === 'object';
}
/**
 * Generate an http message string using the fetch API
 *
 * @param input Fetch input
 * @param init Fetch init
 * @returns The http message string
 */ export default function fetchHttpMessage(input, init) {
    if (input === undefined) throw new Error('Input is expected');
    if (init === undefined) init = {};
    let url;
    if (isRequest(input)) url = input.url;
    else {
        url = input;
        input = {};
    }
    let method = init.method || input.method || 'GET';
    method = method.toUpperCase();
    const lines = [
        `${method} ${url} HTTP/1.1`
    ];
    const headers = init.headers || input.headers;
    if (headers !== undefined) {
        /* c8 ignore start */ if (hasHeaders && headers instanceof Headers) {
            headers.forEach((value, key)=>lines.push(`${key}: ${value}`));
        } else {
            /* c8 ignore stop */ for(const key in headers)lines.push(`${key}: ${headers[key]}`);
        }
    }
    const body = init.body;
    if (body !== undefined) {
        if (~[
            'GET',
            'HEAD'
        ].indexOf(method)) throw new Error(`Option body not valid with method ${method}`);
        /* c8 ignore start */ if (hasBlob && body instanceof Blob) {
            lines.push('');
            lines.push(blobToString(body));
        } else if (/* c8 ignore stop */ typeof body === 'string' || body instanceof String || /* c8 ignore start */ hasBuffer && body instanceof Buffer || hasURLSearchParams && body instanceof URLSearchParams) {
            lines.push('');
            lines.push(body.toString());
        } else throw new Error('Option body should be convertible to a string');
    }
    return lines.join('\r\n');
}