> For clean Markdown content of this page, append .md to this URL. For the complete documentation index, see https://buildwithfern.com/learn/llms.txt. ## 4.19.0 **`(fix):`** With `respect-optional-request-body` enabled, a call that leaves out an optional request body now passes a null body to OkHttp instead of an empty one, so the request carries no body at all. The methods OkHttp requires a body for (POST, PUT, PATCH) still send an empty body, which is what endpoints with no request body at all already send. **`(feat):`** Add a `respect-optional-request-body` option. When enabled, an endpoint whose request body the API does not require also gets an overload without the body parameter, and calling that overload sends no body. The body parameter keeps its own type, so `alpha(String id, Body body)` gains a sibling `alpha(String id)` rather than becoming `alpha(String id, Optional body)`. Examples that supply no body render as `client.alpha(id)`. That call also leaves out the `Content-Type` header, which now only goes out when a body does. The option defaults to false, so existing signatures and snippets are unchanged. ## 4.18.2 **`(fix):`** Build an empty request body in snippets for an endpoint example that omits a body the wrapped request requires, instead of leaving the builder's required `body` stage unset. ## 4.18.1 **`(fix):`** Fix the generated OAuth token supplier when the get-token request has required properties other than the client credentials. The builder calls are now ordered by the request's required properties, so the staged builder's stages are satisfied in order, and hardcoded values (such as `grant_type`) are written using the property's type, which means an enumerated `grant_type` gets the generated enum constant instead of a string literal.