Online HTTP interface testing tool

Provide HTTP GET and POST tests for any interface, and provide test return values ​​and interface return times. Abnormal status data will be obtained later.
The front end of the code gets the form data, ajax goes to the backend, and php uses parameters to simulate the request and return the data.

header('Content-type:text/html;charset=utf-8');
function fly_curl($url, $postFields = null) {
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (compatible; MSIE 5.01; Windows NT 5.1)');
    curl_setopt($ch, CURLOPT_HEADER, 0);
    curl_setopt($ch, CURLOPT_FAILONERROR, 0);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    //curl_setopt($ch,CURLOPT_HTTPHEADER,array("Expect:"));
    if (is_array($postFields) && 0 < count($postFields)) {
        $postBodyString = "";
        $postMultipart = false;
        //判断是不是文件上传
        foreach ($postFields as $k => $v) {
            if("@" != substr($v, 0, 1)) {
                $postBodyString .= "$k=" . urlencode($v) . "&";
            }
            //文件上传用multipart/form-data，否则用www-form-urlencoded
            else {
                $postMultipart = true;
            }
        }
        unset($k, $v);
        curl_setopt($ch, CURLOPT_POST, 1);
        if ($postMultipart) {
            curl_setopt($ch, CURLOPT_POSTFIELDS, $postFields);
        }
        else {
            //var_dump($postBodyString);
            curl_setopt($ch, CURLOPT_POSTFIELDS, substr($postBodyString,0,-1));
        }
    }
    $reponse = curl_exec($ch);
    //return curl_getinfo($ch);
    if (curl_errno($ch)) {
        throw new Exception(curl_error($ch),0);
    }
    else {
        $httpStatusCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        if (200 !== $httpStatusCode) {
            throw new Exception($reponse,$httpStatusCode);
        }
    }
    curl_close($ch);
    return $reponse;
}
function microtime_float(){
    list ($usec, $sec) = explode(" ", microtime());
    return ((float) $usec + (float) $sec);
}