Question
How can I resolve the error regarding the usage of the @Body annotation in a @DELETE method in Retrofit?
"@DELETE("/job/deletejob")\nObservable<JobDeleteResponseModel> jobDelete(@Body JobDeleteRequestModel model);"
Answer
In Retrofit, the '@DELETE' method signifies a request that does not contain a body. Therefore, trying to include a '@Body' parameter in this method results in an error: 'Non-body HTTP method cannot contain @Body or @TypedOutput.' Instead, information that you want to pass alongside a DELETE request typically must be passed via the request URL or as query parameters.
@HTTP(method = "DELETE", hasBody = true)\nObservable<JobDeleteResponseModel> jobDelete(@Body JobDeleteRequestModel model);
Causes
- The '@DELETE' HTTP method is defined to be stateless and does not support a request body in HTTP specifications.
- Including a '@Body' parameter in a DELETE request contradicts the conventional design of the RESTful service, leading to compatibility issues with the Retrofit library.
Solutions
- Pass parameters directly in the URL or use query parameters instead.
- Change the method to '@HTTP' with the method type set to DELETE to allow a request body if absolutely necessary, although it's generally discouraged.
Common Mistakes
Mistake: Using @Body with DELETE requests.
Solution: Remove the @Body parameter and pass any required data through URL parameters.
Mistake: Assuming all HTTP methods can accept a body.
Solution: Review the HTTP specification to understand which methods can contain a request body.
Helpers
- Retrofit @DELETE method
- Non-body HTTP method error
- Retrofit @Body annotation
- HTTP methods in Retrofit
- RESTful DELETE request best practices
