rn-headers-dev-noremote.json

{
    "ACCEPT": "application/json",
    "ACCEPT_ENCODING": "gzip",
    "ACCEPT_LANGUAGE": "en-US",
    "CONNECTION": "Keep-Alive",
    "CONTENT_TYPE": "application/json",
    "HOST": "www.whatismybrowser.com",
    "USER_AGENT": "okhttp/3.6.0"
}

rn-headers-dev-remote.json

 {
     "ACCEPT": "application/json",
     "ACCEPT_ENCODING": "gzip",
     "ACCEPT_LANGUAGE": "en-US",
     "CONNECTION": "Keep-Alive",
     "CONTENT_TYPE": "application/json",
     "HOST": "www.whatismybrowser.com",
     "USER_AGENT": "okhttp/3.6.0"
 }

snippet.js

(async function() {
    const res = await fetch('https://www.whatismybrowser.com/detect/what-http-headers-is-my-browser-sending')
    const text = await res.text();
    const patt = /<th>([\s\S]*?)<\/th>[\s\S]*?<td>([\s\S]*?)<\/td>/mg;
    const headers = {};
    let match;
    while (match = patt.exec(text)) {
        const [, key, value] = match;
        headers[key] = value;
    }
    alert(JSON.stringify(headers));
    // const info = [];
    // for (const p in DeviceInfo) {
    //     try {
    //         info.push(`${p}: "${DeviceInfo[p]()}"`);
    //     } catch (ignore) {}
    // }
    // alert(info.join('\n'));
})()

(async function() {
    const res = await fetch('https://www.whatismybrowser.com/detect/what-http-headers-is-my-browser-sending')
    const text = await res.text();

    const patt = /<th>([\s\S]*?)<\/th>[\s\S]*?<td>([\s\S]*?)<\/td>/mg;
    const headers = {};
    let match;
    while (match = patt.exec(text)) {
        const [, key, value] = match;
        headers[key] = value;
    }
    alert(JSON.stringify(headers));

    const info = [];
    const pBad = ['getIPAddress', 'getMACAddress', 'isPinOrFingerprintSet', 'getPhoneNumber'];
    for (const p in DeviceInfo) {
        if (pBad.includes(p)) continue;
        info.push(`${p}: "${DeviceInfo[p]()}"`);
    }
    alert(info.join('\n'));
})()