> For clean Markdown content of this page, append .md to this URL. For the complete documentation index, see https://buildwithfern.com/learn/llms.txt. ## 1.23.0 **`(fix):`** Endpoints whose request body is a referenced type no longer serialize path parameters into the JSON body. With `respectOptionalRequestBody`, an omitted optional body on such an endpoint now sends no body and no `Content-Type` instead of a body containing the path parameters. **`(feat):`** Add the `respectOptionalRequestBody` configuration option. When enabled, an endpoint whose request body the API does not require lets callers omit the body: the request then carries neither a body nor a `Content-Type` header, instead of sending `{}` as `application/json`. Disabled by default.