إصلاح خطأ 502 Bad Gateway في البروكسي العكسي

يعني أن البروكسي (Nginx) حاول الاتصال بالسيرفر الخلفي (Backend) وفشل. قد يكون السيرفر الخلفي متوقفًا، أو يرفض الاتصال، أو بطيئًا جدًا.

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