René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Invalid generated code on reusing responses","articleBody":"Hi,\n\nwe just upgraded from oapi-codegen 2.3.0 to 2.5.1 and our go code generated from OpenAPI isn't valid anymore. I pinned down the issue to response components being referenced in endpoints and came up with this minimal reproducible spec:\n\n```\nopenapi: 3.0.3\ninfo:\n  title: test\n  version: 1.0.0\nservers:\n  - url: https://te.st\npaths:\n  /v1/test:\n    get:\n      operationId: GetTest\n      responses:\n        \"200\":\n          $ref: \"#/components/responses/Success\"\n        \"401\":\n          $ref: \"#/components/responses/Unauthorized\"\ncomponents:\n  responses:\n    Success:\n      description: Success\n      content:\n        application/json:\n          schema:\n            type: string\n    Unauthorized:\n      description: Unauthorized\n      content:\n        text/plain:\n          schema:\n            type: string\n          example: \"Unauthorized\"\n```\n\nWe execute oapi-codegen with this configuration:\n```\npackage: test\noutput: api.gen.go\ngenerate:\n  std-http-server: true\n  strict-server: true\n  models: true\n  client: true\noutput-options:\n  nullable-type: true\n```\n\nThe generated go code contains this:\n```\ntype UnauthorizedTextResponse string\n\ntype GetTest401TextResponse struct{ UnauthorizedTextResponse }\n\nfunc (response GetTest401TextResponse) VisitGetTestResponse(w http.ResponseWriter) error {\n\tw.Header().Set(\"Content-Type\", \"text/plain\")\n\tw.WriteHeader(401)\n\n\t_, err := w.Write([]byte(response))\n\treturn err\n}\n```\n\nwhich is invalid as `response` is of type `GetTest401TextResponse` and cannot be converted to `[]byte`.\n\nWe are using Go version 1.25.7.\n\nI would appreciate if you could have a look, would also be happy to contribute.\nCheers ","author":{"url":"https://github.com/bravenut","@type":"Person","name":"bravenut"},"datePublished":"2026-01-28T11:48:58.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":4},"url":"https://github.com/2190/oapi-codegen/issues/2190"}