Guzzle 6: change body response

guzzle_change_body.php

<?php
/**
* sources: 
*   http://docs.guzzlephp.org/en/latest/handlers-and-middleware.html#middleware
*   https://evertpot.com/222/
*   
*/
use GuzzleHttp\Client;
use GuzzleHttp\Handler\CurlHandler;
use GuzzleHttp\HandlerStack;
use GuzzleHttp\Middleware;
use GuzzleHttp\Psr7\Response;
use Psr\Http\Message\ResponseInterface;

$handler = HandlerStack::create();
$handler->setHandler(new CurlHandler());

$handler->push(Middleware::mapResponse(function(ResponseInterface $r){
    if(isset($r->getHeader('Content-Type')[0]) && $r->getHeader('Content-Type')[0] == 'text/html;charset=ISO-8859-1')
        $newBody = utf8_encode(urldecode($r->getBody()->getContents()));
        $streamBody = fopen('data://text/plain,' . $newBody,'r');//new resource from string

        $newResponse = $r->withoutHeader('Content-Type')
            ->withHeader('Content-Type', 'text/html; charset=UTF-8')
            ->withBody(new \GuzzleHttp\Psr7\Stream($streamBody));
        return $newResponse;
    }
    return $r;
}));

$client = new Client([
    'handler' => $handler,
]);

Note: If there is URL data in $newBody, you should replace it with urlencode($newBody).

https://gist.github.com/jhonata-menezes/382d4ba3e2ab86846bc650adaf8de8bc#file-guzzle_change_body-php-L21