使用cURL返回API XML响应

Question

Forgive me if this is simple. My research has brought me to a halt at the moment. I am trying to use cURL to get the response of an API in XML.

This is the URL of the API: https://api.weather.gov/alerts/active/region/land

By default it returns in JSON. Which I know, I should just use the JSON response but, there is a reason I need it in XML as it will seamlessly integrate into my current code until I can rewrite it for JSON.

This is the documentation for the API. Under the API Reference tab is states I just need to change the request header to application/cap+xml. But I am not getting anything back. Just a blank white page.

https://alerts-v2.weather.gov/documentation

Here is my current code I am using to call the API but I get no response or anything. What am I missing?

    <?php

     $headers[] = 'Connection: Keep-Alive';
     $headers[] = 'Content-Type: application/cap+xml;charset=utf-8';
     $headers[] = 'Accept: application/cap+xml';

     $userAgent = 'php';

     $url = 'https://api.weather.gov/alerts/active/region/land';

     $cURL = curl_init();

     curl_setopt($cURL, CURLOPT_URL, $url);
     curl_setopt($cURL, CURLOPT_HTTPHEADER, $headers);
     curl_setopt($cURL, CURLOPT_USERAGENT, $userAgent);
     curl_setopt($cURL, CURLOPT_RETURNTRANSFER, true);
     curl_setopt($cURL, CURLOPT_HTTPGET, true);

     $result = curl_exec($cURL);

     curl_close($cURL);

?>

Answer 1

I've just tried your code and it works fine with atom:

$headers[] = 'Accept: application/atom+xml';

"application/cap+xml" is not available for the URLs, like you mentioned in a question though.

Per the doc https://alerts-v2.weather.gov/documentation the formats are following:

/alerts/active/region/{region} => JSON-LD (default), ATOM 
/alerts/{alertId}   => JSON-LD (default), CAP