Could you show the example code?

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This is just an example. It happens every now and then when there is a problem with the Telegram server infrastructure. You can google for "502 Bad Gateway Telegram BOT" and will find some hits. In general, you assume that you get a well formed JSON response to every HTTP request to the Telegram server. In case you don't, an exception is thrown but all information about the error (HTTP code + error message) is lost.

I suggest you test for malformed JSON and then return the complete HTTP body.

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Here's an example of such a server error:

$ curl -s -X POST https://api.telegram.org/bot(token)/sendPhoto -F chat_id=(chatid) -F photo="@/tmp/image.png"
`

502 Bad Gateway

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Done. Thanks!

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Thank you, that helps.

Note that there is still a hypothetical case that you do not get back well formed JSON. In this case an exception is thrown but the error information is lost.

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