如何使 API POST 调用请求的重定向与 HTML POST 请求完全相同

Question

Below is my code using curl and it's not really redirect like HTML form :

$curl =  new \Curl\Curl();
        $curl->setHeader('Content-Type', 'application/x-www-form-urlencoded');
        $curl->setOpt(CURLOPT_FOLLOWLOCATION,true);
        $curl->setOpt(CURLOPT_POST,true);
        $curl->setOpt(CURLOPT_RETURNTRANSFER,true);
        $curl->post('http://localpay.sample.test/make-payment',$params);

Hi guys,
above are the sample code that I made using php package : curl/curl ,
but don't worry,I'm looking forward for any answer,answer using pure curl also can and any other answer also can as long it's working with php language.

What I'm trying to achieve is how to do an API call works exactly the same like HTML form. Why I want to achieve this ? because in the HTML form we need to click the submit button,I know javascript can do the trigger but I'm trying to build my own package with totally back-end language.

I already tried search for the questions on the internet, but none was what I expected.

And below is my simple html form and it does redirect to the desired url :

<form id="payment_confirmation" action="http://localpay.sample.test/make-payment" method="post"/>

   Payer ID : <input type="text" name="payer_acc_id"><br>
   Payee ID : <input type="text" name="payer_acc_id"><br>
   <input type="hidden" name="signature" value="somePhpFunction()">

    <button type="submit" value="Submit"> Submit</button>

</form>

Above is the sample working HTML form and it's redirect to that action url path but in curl I fail to achieve it, so how do I achieve this by using curl or any other ways also can.

Answer 1

setting the Content-Type header does not dictate which format curl will use to send the post data. if you give CURLOPT_POSTFIELDS an array then curl will send the data using the multipart/form-data format, regardless of what you put in the Content-Type header. most likely your curl code sends the data in the Multipart/form-data format and $params is an array, and because you tell the server this is application/x-www-form-urlencoded , the server ties to parse the multipart/form-data data as application/x-www-form-urlencoded , (which is a completely incompatible format), and doesn't understand the data at all. if you want to convert an array of post data to the application/x-www-form-urlencoded -format, use the http_build_query function, eg

    $curl->post('http://localpay.sample.test/make-payment',http_build_query($params));

Answer 2

I found the answer for POST redirect using curl :

$params = ['payee_id' => 1 , 'amount' => 300];

$curl = curl_init('http://someurl.com/silent/pay');
        curl_setopt($curl, CURLOPT_FOLLOWLOCATION, true);
        curl_setopt($curl, CURLOPT_CUSTOMREQUEST, "POST");
        curl_setopt($curl, CURLOPT_POSTFIELDS, json_encode($params));    
        curl_exec($curl);

curl will follow the redirect for POST method, if you guys want more explanation,go here .