[BUG] Response body is missing from custom exception message

Bug Report Checklist

Have you provided a full/minimal spec to reproduce the issue?
Have you validated the input using an OpenAPI validator?
Have you tested with the latest master to confirm the issue still exists?
Have you searched for related issues/PRs?
What's the actual output vs expected output?
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Description

When using the API client and encountering an exception, the user sees

E           ...exceptions.ServiceException: (500)
E           Reason: Internal Server Error
E           HTTP response headers: HTTPHeaderDict(...)
E           HTTP response body: error=None

This is unfortunate, as the useful response body of the exception is "overriden" by the not-useful response data "error=None"

openapi-generator version

7.14.0

OpenAPI declaration file content or url

Generation Details

Steps to reproduce

Create a call against a client which produces e.g. a 500 error, with an http response containing response data, and a useful response body. The useful response body will be missing from the exception str.

Related issues/PRs

#22352

Suggest a fix

master...ddl-rliu:openapi-generator:patch-1

I found it a bit hard to describe the issue in words, but looking at the code the issue (and fix!) is relatively straightforward.

modules/openapi-generator/src/main/resources/python/exceptions.mustache
...
        if self.data or self.body:
            error_message += "HTTP response body: {0}\n".format(self.data or self.body)

Note that the response body may get "overriden" by the response data, which is unfortunate in cases where the repsonse body contains very useful logs.

[BUG] Fix OpenAPITools#22351 by updating exceptions.mustache to log b…

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[BUG] Response body is missing from custom exception message #22351

Bug Report Checklist

Description

openapi-generator version

OpenAPI declaration file content or url

Generation Details

Steps to reproduce

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Suggest a fix

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[BUG] Response body is missing from custom exception message #22351

Description

Bug Report Checklist

Description

openapi-generator version

OpenAPI declaration file content or url

Generation Details

Steps to reproduce

Related issues/PRs

Suggest a fix

Activity

ddl-rliu commented on Nov 14, 2025

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