OpenAPI endpoint returns empty file if schema definition contains non ASCII character ------------------------------------------------------------------------------------- Key: WFLY-13333 URL: https://issues.redhat.com/browse/WFLY-13333 Project: WildFly Issue Type: Bug Components: MP OpenAPI Affects Versions: 19.0.0.Final Reporter: Márk Petrényi Assignee: Paul Ferraro Priority: Blocker Fix For: 19.0.1.Final, 20.0.0.Beta1 Currently the {{/openapi}} endpoint returns empty file if the OpenAPI schema definition contains non ASCII characters (ie. accented letters like á,í...). I extended the openapi quickstart for demonstration: https://github.com/petrenyi-mark/quickstart/commit/44096980ff36ff2655859f... It seems like it is related to the content-length, since in {{OpenAPIHttpHandler}} the content-length header is set by {{String.length()}} (line 125). However before the response is actually returned, undertow validates that the actual content-length based on ByteBuffer size is not greater then the one declared in the response header. Since non ASCII characters are usually represented by 2 bytes undertow will fail, thus no content will be returned. In {{OpenAPIHttpHandler}} setting {{string.getBytes(charset).length}} as Conetnt-Length instead of {{String.length()}} would likely resolve this issue.