export default function(url, options) {
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options = options || {};
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return new Promise( (resolve, reject) => {
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const request = new XMLHttpRequest();
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const keys = [];
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const all = [];
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const headers = {};
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const response = () => ({
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ok: (request.status/100|0) == 2, // 200-299
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statusText: request.statusText,
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status: request.status,
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url: request.responseURL,
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text: () => Promise.resolve(request.responseText),
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json: () => Promise.resolve(request.responseText).then(JSON.parse),
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blob: () => Promise.resolve(new Blob([request.response])),
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clone: response,
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headers: {
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keys: () => keys,
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entries: () => all,
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get: n => headers[n.toLowerCase()],
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has: n => n.toLowerCase() in headers
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}
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});
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request.open(options.method || 'get', url, true);
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request.onload = () => {
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request.getAllResponseHeaders().replace(/^(.*?):[^\S\n]*([\s\S]*?)$/gm, (m, key, value) => {
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keys.push(key = key.toLowerCase());
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all.push([key, value]);
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headers[key] = headers[key] ? `${headers[key]},${value}` : value;
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});
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resolve(response());
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};
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request.onerror = reject;
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request.withCredentials = options.credentials=='include';
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for (const i in options.headers) {
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request.setRequestHeader(i, options.headers[i]);
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}
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request.send(options.body || null);
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});
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}
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