Привет. 
При отправке формы TelegramBot выдает 502 Bad Gateway.
Ниже обработчик
Сайт на vue.js
crossDomainPost({commit}, param) {
			const chatBot = 21312;
			const chatId = 123123;
			const iframe = document.createElement("iframe");
			const uniqueString = "CHANGE_THIS_TO_SOME_UNIQUE_STRING";
			document.body.appendChild(iframe);
			iframe.style.display = "none";
			iframe.contentWindow.name = uniqueString;
			const form = document.createElement("form");
			form.target = uniqueString;
			if (param === 'feedback') {
				const subject = 'Feedback';
				const field1 = 'Name:';
				const field2 = 'Company:';
				const field3 = 'Email:';
				const field4 = 'Phone:';
				form.action =
					"
https://api.telegram.org/bot" + chatBot + ":AAFbKchTA9zDxOSfRW-8IVH2A6r3VTAjUV4/sendMessage?chat_id=" + chatId + "&text=" + subject + "%0A" + field1 + " " + document.querySelector('input[name="feedName"]').value + "%0A" + field2 + " " + document.querySelector('input[name="feedCompany"]').value  + "%0A" + field3 + " " + document.querySelector('input[name="feedEmail"]').value  + "%0A" + field4 + " " + document.querySelector('input[name="feedPhone"]').value;
			}
			form.method = "POST";
			// repeat for each parameter
			const input = document.createElement("input");
			input.type = "hidden";
			input.name = "INSERT_YOUR_PARAMETER_NAME_HERE";
			input.value = "INSERT_YOUR_PARAMETER_VALUE_HERE";
			form.appendChild(input);
			document.body.appendChild(form);
			form.submit();
		}