No retry on HTTP Error 520 ( Unknown error )

[zzgael]

This is the first time that I get to see it but the API just thrown a html-shaped 520 error.
Return webpage title was : api.hubapi.com | 520: Web server is returning an unknown error

This error is not handled by the /hubspot/api-client/lib/RetryMiddlewareFactory.php

    public static function createInternalErrorsMiddleware(
        ?callable $delayFunction = null,
        int $maxRetries = 5
    ) {
        return static::createMiddlewareByHttpCodeRange(500, 504, $delayFunction, $maxRetries);
    }

Solution : change the handled HTTP Error codes to the following ranges : 500-503 and 520-599.
Two proposed changes :

• 504 is removed from the list to allow for a retry in case of server failure.
• range 520-599 is added in order to allow for new codes like the 525 Cloudflare one.

Range 505-511 would still be considered as an exception without retry.

[zzgael]

#433