I don't know what this method called : Reverse Proxy , Tunneling, Bypassing ?

Imagine, we have 3 website :

http://exampleapi.com - API or Service provider
http://example1.com - I bought the API for this Website from example.com
http://example2.com - My New website

1. I bought the API or Payment Gateway service for example1.com , the website don't have any content , forms, data. (Just to get the API)

2. Now, I want create tunnel between example2.com | example1.com | exampleapi.com. I mean, get all request from example2.com , send to example1.com and pass the data to exampleapi.com.

3. And after response, the exampleapi.com.com send data to example1.com and example2.com will receive it and showing to the user.

CodePudding user response：

Here's an example of how you can write your code. You can simulate this on a single site like I did. On my site, I created 3 folders:

example1
example2
exampleapi

Under each of them, I create an index.php file. Let's look at them.

yoursite.com/exampleapi/index.php

<?php
header("Content-Type: application/text");
echo 'Titanic vs. Iceberg';

The output of this is plaintext

Titanic vs. Iceberg

We'll call this API from example1.

yoursite.com/example1/index.php

This site's code will have it's own data and will pull data from exampleapi/index.php like so:

<?php

// call exampleapi
$url = 'https://yoursite.com/exampleapi/index.php';
$curl = curl_init($url);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
curl_setopt($curl, CURLOPT_HTTPHEADER, [
    'Content-Type: application/json'
]); 
$response = curl_exec($curl);
curl_close($curl);

// show data
header("Content-Type: application/json");
$data = [ 
    'name' => 'John',
    'age' => 25, 
    'data_from_exampleapi' => $response
];
echo json_encode($data);

Output of this code will be

{"name":"John","age":25,"data_from_exampleapi":"Titanic vs. Iceberg"}

We'll call this from example2.

yoursite.com/example2/index.php

This will be your webpage. I have simulated a call. When the button is pressed, PHP will send a request to example1/index.php. And that page will send a request to exampleapi/index.php, fetch the data, combine the fetched data with its own data and send it back to example2/index.php

<?php
function fetchInformation()
{
    $url = 'https://yoursite.com/example1/index.php';
    $curl = curl_init($url);
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($curl, CURLOPT_HTTPHEADER, [
        'Content-Type: application/json'
    ]); 
    $response = curl_exec($curl);
    curl_close($curl);

    return $response;
}
?>
<!doctype html>
<body>
    <form action="./" method="get">
        <p> 
            When you press this button, PHP will try to get data from
            example1/index.php and show information
            below
        </p>
        <input type="submit" value="Get data from API" name="mybutton" id="mybutton">
    </form>

    <?php
    // only if button is pressed, fetch information
    if ($_SERVER['REQUEST_METHOD'] === 'GET')
    {   
        if ( ! is_null($_REQUEST['mybutton']) )
        {   
            echo '<h3>Information received</h3>';
            $response = fetchInformation();
            echo '<p>' . $response . '</p>';
        }   
    }   
    ?>  
</body>

When you go to yoursite.com/example2/index.php, you'll see something like this:

When you press the button, example2/index.php -> calls example1/index.php -> calls exampleapi/index.php. Data goes in reverse and you'll see this kind of an output:

This shows you how you can use PHP one 1 page to call API on another page. If you are in control of that another page, you can tweak code to call API from yet-another-page.