SendGrid Bad Gateway

[JASchilz]

I'm getting a bad gateway error when sending an e-mail with SendGrid. I've confirmed that:

1. The error occurs with the example code provided in README.md
2. The error doesn't occur when using the bare SendGrid library.
3. The error occurs on multiple machines.

I can reproduce as follows:

$ composer require sendgrid/sendgrid
$ composer require omnimail/omnimail

/* test1.php */
<?php
require_once (__DIR__ . '/vendor/autoload.php');

use Omnimail\Email;
use Omnimail\Sendgrid;

$mailer = new Sendgrid(MY_REAL_LIFE_SG_KEY);

$email = (new Email())
    ->addTo('example@email.com')
    ->setFrom('example@email.com')
    ->setSubject('Hello, world!')
    ->setTextBody('Hello World! How are you?');

$mailer->send($email);

/* test2.php */
<?php
require_once (__DIR__ . '/vendor/autoload.php');

$from = new SendGrid\Email("Example User", "test@example.com");
$subject = "Sending with SendGrid is Fun";
$to = new SendGrid\Email("Example User", "test@example.com");
$content = new SendGrid\Content("text/plain", "and easy to do anywhere, even with PHP");
$mail = new SendGrid\Mail($from, $subject, $to, $content);

$sg = new \SendGrid(MY_REAL_LIFE_SG_KEY);

$response = $sg->client->mail()->send()->post($mail);
echo $response->statusCode();
print_r($response->headers());
echo $response->body();

$ php test1.php
PHP Fatal error:  Uncaught exception 'Omnimail\Exception\InvalidRequestException' in C:\Users\jschilz\test\vendor\omnimail\omnimail\src\Sendgri
d.php:137
Stack trace:
#0 C:\Users\jschilz\test\test1.php(15): Omnimail\Sendgrid->send(Object(Omnimail\Email))
#1 {main}
  thrown in C:\Users\jschilz\test\vendor\omnimail\omnimail\src\Sendgrid.php on line 137

Fatal error: Uncaught exception 'Omnimail\Exception\InvalidRequestException' in C:\Users\jschilz\test\vendor\omnimail\omnimail\src\Sendgrid.php
 on line 137

Omnimail\Exception\InvalidRequestException:  in C:\Users\jschilz\test\vendor\omnimail\omnimail\src\Sendgrid.php on line 137

Call Stack:
    0.0002     124920   1. {main}() C:\Users\jschilz\test\test1.php:0
    0.0056     425304   2. Omnimail\Sendgrid->send() C:\Users\jschilz\test\test1.php:15

I put some debugging statements inside SendGrid.php to determine that SendGrid is returning a 502 Bad Gateway response.

$ php test2.php
202Array
(
    [0] => HTTP/1.1 202 Accepted
    [1] => Server: nginx
    [2] => Date: Tue, 23 Jan 2018 00:26:40 GMT
    [3] => Content-Type: text/plain; charset=utf-8
    [4] => Content-Length: 0
    [5] => Connection: keep-alive
    [6] => X-Message-Id: AFEhnCqnT46tLy-1FAdm-A
    [7] => Access-Control-Allow-Origin: https://sendgrid.api-docs.io
    [8] => Access-Control-Allow-Methods: POST
    [9] => Access-Control-Allow-Headers: Authorization, Content-Type, On-behalf-of, x-sg-elas-acl
    [10] => Access-Control-Max-Age: 600
    [11] => X-No-CORS-Reason: https://sendgrid.com/docs/Classroom/Basics/API/cors.html
    [12] =>
    [13] =>
)

I can work to trouble shoot this tomorrow, but I thought I'd post the issue tonight incase the solution is obvious to you. (:

[gabrielbull]

Ah no, it's not obvious straight away. They may have changed the way their library works and it's broken ours.