bad_gateway

Returned as application/problem+json with code bad_gateway and HTTP status 502.

An upstream service the gateway depends on returned an invalid or unexpected response.

Common causes

• A downstream service failed or returned something outside its contract.

How to resolve

• Usually transient — retry with backoff.
• If it persists, contact support with the request_id.

Example

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{
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  "type": "https://docs.usglobalmail.com/api/problems/bad_gateway",
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  "title": "An upstream service returned an invalid response.",
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  "status": 502,
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  "code": "bad_gateway",
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  "request_id": "req_8f3c2a1b9d",
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  "instance": "/v1/mails"
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}