Should a RESTful PUT operation return something

Question

I was wondering what people s opinions are of a RESTful PUT operation that returns nothing  null  in the response body

User · Answer

As opposed to most of the answers here  I actually think that PUT should return the updated resource  in addition to the HTTP code of course    The reason why you would want to return the resource as a response for PUT operation is because when you send a resource representation to the server  the server can also apply some processing to this resource  so the client would like to know how does this resource look like after the request completed successfully   otherwise it will have to issue another GET request

User · Answer

seems ok    though I d think a rudimentary indication of success failure time posted   bytes received etc  would be preferable   edit  I was thinking along the lines of data integrity and or record-keeping  metadata such as an MD5 hash or timestamp for time received may be helpful for large datafiles

User · Answer

The HTTP specification  RFC 2616  has a number of recommendations that are applicable  Here is my interpretation    HTTP status code 200 OK for a successful PUT of an update to an existing resource  No response body needed   Per Section 9 6  204 No Content is even more appropriate   HTTP status code 201 Created for a successful PUT of a new resource  with the most specific URI for the new resource returned in the Location header field and any other relevant URIs and metadata of the resource echoed in the response body   RFC 2616 Section 10 2 2  HTTP status code 409 Conflict for a PUT that is unsuccessful due to a 3rd-party modification  with a list of differences between the attempted update and the current resource in the response body   RFC 2616 Section 10 4 10  HTTP status code 400 Bad Request for an unsuccessful PUT  with natural-language text  such as English  in the response body that explains why the PUT failed   RFC 2616 Section 10 4

User · Answer

Just as an empty Request body is in keeping with the original purpose of a GET request and empty response body is in keeping with the original purpose of a PUT request

User · Answer

There s a difference between the header and body of a HTTP response  PUT should never return a body  but must return a response code in the header  Just choose 200 if it was successful  and 4xx if not  There is no such thing as a null return code  Why do you want to do this

User · Answer

I used RESTful API in my services  and here is my opinion  First we must get to a common view  PUT is used to update an resource not create or get   I defined resources with  Stateless resource and Stateful resource    Stateless resources For these resources  just return the HttpCode with empty body  it s enough  Stateful resources For example  the resource s version  For this kind of resources  you must provide the version when you want to change it  so return the full resource or return the version to the client  so the client need t to send a get request after the update action    But  for a service or system  keep it simple  clearly  easy to use and maintain is the most important thing

User · Answer

I think it is possible for the server to return content in response to a PUT  If you are using a response envelop format that allows for sideloaded data  such as the format consumed by ember-data   then you can also include other objects that may have been modified via database triggers  etc   Sideloaded data is explicitly to reduce   of requests  and this seems like a fine place to optimize    If I just accept the PUT and have nothing to report back  I use status code 204 with no body  If I have something to report  I use status code 200  and include a body

User · Answer

If the backend of the REST API is a SQL relational database  then    you should have RowVersion in every record that can be updated  to avoid the lost update problem  you should always return a new copy of the record after PUT  to get the new RowVersion     If you don t care about lost updates  or if you want to force your clients to do a GET immediately after a PUT  then don t return anything from PUT

User · Answer

Ideally it would return a success fail response

User · Answer

The HTTP 1 1 spec  section 9 6  discusses the appropriate response error codes  However it doesn t address the response content   What would you expect   A simple HTTP response code  200 etc   seems straightforward and unambiguous to me

User · Answer

Http response code of 201 for  Created  along with a  Location  header to point to where the client can find the newly created resource

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