What is the proper REST response code for a valid request but an empty data

Question

For example you run a GET request for users 9 but there is no user with id  9  Which is the best response code    200 OK 202 Accepted 204 No Content 400 Bad Request 404 Not Found

User · Answer

If it s expected that the resource exists  but it might be empty  I would argue that it might be easier to just get a 200 OK with a representation that indicates that the thing is empty   So I d rather have  things return a 200 OK with   Items       than a 204 with nothing at all  because in this way a collection with 0 items can be treated just the same as a collection with one or more item in it   I d just leave the 204 No Content for PUTs and DELETEs  where it might be the case that there really is no useful representation   In the case that  thing 9 really doesn t exist  a 404 is appropriate

User · Answer

I strongly oppose 404 in favour of 204 or 200 with empty data  Or at least one should use a response entity with the 404  The request was received and properly processed - it did trigger application code on the server  thus one cannot really say that it was a client error and thus the whole class of client error codes  4xx  is not fitting  More importantly  404 can happen for a number of technical reasons  E g  the application being temporarily deactivated or uninstalled on the server  proxy connection issues and whatnot  Therefore the client cannot distinguish between a 404 that means  quot empty result set quot  and a 404 that means  quot the service cannot be found  try again later quot   This can be fatal  Imagine an accounting service in your company that lists all the employees that are due to an annual bonus  Unfortunately  the one time when it is called it returns a 404  Does that mean that no-one is due for a bonus  or that the application is currently down for a new deployment  - gt  For applications that care about the quality of their data  404 without response entity therefore is pretty much a no-go  Also  many client frameworks respond to a 404 by throwing an exception with no further questions asked  This forces the client developer to catch that exception  to evaluate it  and then to decide based on that whether to log it as an error that is picked up by e g  a monitoring component or whether to ignore it  That doesn t seem pretty to me either  The advantage of 404 over 204 is that it can return a response entity that may contain some information about why the requested resource was not found  But if that really is relevant  then one may also consider using a 200 OK response and design the system in a way that allows for error responses in the payload data  Alternatively  one could use the payload of the 404 response to return structured information to the caller  If he receives e g  a html page instead of XML or JSON that he can parse  then that is a good indicator that something technical went wrong instead of a  quot no result quot  reply that may be valid from the caller s point of view  Or one could use a HTTP response header for that  Still i would prefer a 204 or 200 with empty response though  That way the status of the technical execution of the request is separated from the logical result of the request  2xx means  quot technical execution ok  this is the result  deal with it quot   I think in most cases it should be left to the client to decide whether an empty result is acceptable or not  By returning 404 without response entity despite of a correct technical execution the client may decide to consider cases to be errors that simply are no errors  Another quick analogy  Returning 404 for  quot no result found quot  is like throwing a DatabaseConnectionException if a SQL query returned no results  It can get the job done  but there are lots of possible technical causes that throw the same exception which then would be mistaken for a valid result  Another perspective  From an operations point of view a 404 may be problematic  Since it can indicate a connectivity problem rather than a valid service response  i would not want a fluctuating number of  quot valid quot  404s in my metrics dashboards that might conceal genuine technical issues that should be investigated and fixed

User · Answer

There are two questions asked  One in the title and one in the example  I think this has partly led to the amount of dispute about which response is appropriate   The question title asks about empty data  Empty data is still data but is not the same as no data  So this suggests requesting a result set  i e  a list  perhaps from  users  If a list is empty it is still a list therefore a 204  No Content  is most appropriate  You have just asked for a list of users and been provided with one  it just happens to have no content    The example provided instead asks about a specific object  a user   users 9  If user  9 is not found then no user object is returned  You asked for a specific resource  a user object  and were not given it because it was not found  so a 404 is appropriate    I think the way to work this out is if you can use the response in the way you would expect without adding any conditional statement  then use a 204 otherwise use a 404   In my examples I can iterate over an empty list without checking to see if it has content  but I can t display user object data on a null object without breaking something or adding a check to see if it is null   You could of course return an object using the null object pattern if that suits your needs but that is a discussion for another thread

User · Answer

Just an addition from a developer that struggled many times with this situation  As you might have noticed it is always a discussion whether you return a 404 or 200 or 204 when a particular resource does not exist  The discussion above shows that this topic is pretty confusing and opinion based   while there is a http-status-code standard existing    I personally recommend  as it was not mentioned yet I guess  no matter how you decide DOCUMENT IT IN YOUR API-DEFINITION  Of course a client-side developer has in mind when he she uses your particular  quot REST quot - api to use his her knowledge about Rest and expects that your api works this way  I guess you see the trap  Therefor I use a readme where I explicitly define in which cases I use which status code  This doesn t mean that I use some random definion  I always try to use the standard but to avoid such cases I document my usage  The client might think you are wrong in some specific cases but as it is documented  there is no need for additional discussions what saves time for you and the developer  One sentence to the Ops question  404 is a code that always comes in my mind when I think back about starting to develop backend-applications and I configured something wrong in my controller-route so that my Controller method is not called  With that in mind  I think if the request does reach your code in a Controller method  the client did a valid request and the request endpoint was found  So this is an indication not to use 404  If the db query returns not found  I return 200 but with an empty body

User · Answer

To summarize or simplify    2xx  Optional data  Well formed URI  Criteria is not part of URI  If the criteria is optional that can be specified in  RequestBody and  RequestParam should lead to 2xx  Example  filter by name   status  4xx  Expected data   Not well formed URI   Criteria is part of URI   If the criteria is mandatory that can only be specified in  PathVariable then it should lead to 4xx  Example  lookup by unique id   Thus for the asked situation   users 9  would be 4xx  possibly 404  But for  users name superman  should be 2xx  possibly 204

User · Answer

TL DR  Use 404  See This Blog   It explains it very well   Summary of the blog s comments on 204    204 No Content is not terribly useful as a response code for a browser  although according to the HTTP spec browsers do need to understand it as a  don t change the view  response code   204 No Content is however  very useful for ajax web services which may want to indicate success without having to return something   Especially in cases like DELETE or POSTs that don t require feedback     The answer  therefore  to your question is use 404 in your case  204 is a specialized reponse code that you shouldn t often return to a browser in response to a GET   The other response codes that are even less appropriate than 204 and 404    200 should be returned with the body of whatever you successfully fetched   Not appropriate when the entity you re fetching doesn t exist  202 is used when the server has begun work on an object but the object isn t fully ready yet   Certainly not the case here   You haven t begun  nor will you begin  construction of user 9 in response to a GET request   That breaks all sorts of rules  400 is used in response to a poorly formatted HTTP request  for instance malformed http headers  incorrectly ordered segments  etc   This will almost certainly be handled by whatever framework you re using  You shouldn t have to deal with this unless you re writing your own server from scratch  Edit  Newer RFCs now allow for 400 to be used for semantically invalid requests    Wikipedia s description of the HTTP status codes are particularly helpful  You can also see the definitions in the HTTP 1 1 RFC2616 document at www w3 org

User · Answer

At first  I thought a 204 would make sense  but after the discussions  I believe 404 is the only true correct response  Consider the following data  Users  John  Peter METHOD  URL                      STATUS  RESPONSE GET      users                   200      John  Peter  GET      users john              200     John GET      unknown-url-egaer       404     Not Found GET      users kyle              404     User Not found GET      users name kyle         200        DELETE   users john              204     No Content  Some background   the search returns an array  it just didn t have any matches but it has content  an empty array   404 is of course best known for url s that aren t supported by the requested server  but a missing resource is in fact the same  Even though  users  name is matched with users kyle  the user Kyle is not available resource so a 404 still applies  It isn t a search query  it is a direct reference by a dynamic url  so 404 it is   After suggestions in the comments  customizing the message of the 404 is another way of helping out the API consumer to even better distinguish between complete unknown routes and missing entities    Anyway  my two cents

User · Answer

As stated by many  404 is misleading and it doesn t allow the client to discriminate if the request uri doesn t exist  or if the requested uri cannot fetch the requested resource   The 200 status is expected to contain resource data - so it is not the right choice  The 204 status means something else entirely and should not be used as response for GET requests   All other existing status are not applicable  for one reason or the other   I have seen this topic being discussed over and over in multiple places  For me  it is painfully obvious that to eliminate the confusion around the topic  a dedicated success status is needed  Something like  209 - No resource to display    It will be a 2xx status because not finding an ID should not be considered a client error  if the clients knew everything which is in the server s DB  they would not need to ask anything to the server  wouldn t they    This dedicated status will address all issues debated with using other statuses   The only question is  how do I get RFC to accept this as a standard

User · Answer

404 would be very confusing for any client if you return just because there is no data in response    For me  Response Code 200 with an empty body is sufficient enough to understand that everything is perfect but there is no data matching the requirements

User · Answer

It is sad that something so simple and well defined became  opinion based  in this thread   A HTTP server only knows of  entities   which is an abstraction for any content  be it a static web page  a list of search results  a list of other entities  a json description of something  a media file  etc etc   Each such entity is expected to be identifiable by a unique URL  e g     user 9 -- a single entity  a USER ID 9  users -- a single entity  a LIST of all users  media x mp3 -- a single entity  a media FILE called x mp3  search -- a single entity  a dynamic CONTENT based on query params   If a server finds a resource by the given URL  it does not matter what its contents are -- 2G of data  null         -- as long as it exists  it will be 200  But if such entity is not known to the server  it is EXPECTED to return 404  Not Found    One confusion seems to be from developers who think if the application has a handler for a certain path shape  it should not be an error  In the eyes of the HTTP protocol it does not matter what happened in the internals of the server  ie  whether the default router responded or a handler for a specific path shape   as long as there is no matching entity on the server to the requested URL  that requested MP3 file  webpage  user object etc   which would return valid contents  empty or otherwise   it must be 404  or 410 etc    Another point of confusion seems to be around  no data  and  no entity   The former is about content of an entity  and the latter about its existence   Example 1    No data   users returns 200 OK  body     because nobody registered yet No entity   users returns 404 because there is no path  users   Example 2    No data   user 9 returns return 200 OK  body      because user ID 9 never entered his her personal data No entity   user 9 returns 404 because there is no user ID 9   Example 3    No data   search name Joe returns 200 OK     because there are no Joe s in the DB No entity   search name Joe returns 404 because there is no path  search

User · Answer

204 is more appropriate  Especially when you have a alert system to ensure you website is secure  404 in this case would cause confusion because you don t know some 404 alerts is backend errors or normal requests but response empty

User · Answer

What the existing answers do not elaborate on is that it makes a difference whether you use path parameters or query parameters    In case of path parameters  the parameter is part of the resource path  In case of  users 9  the response should be 404 because that resource was not found   users 9 is the resource  and the result is unary  or an error  it doesn t exist  This is not a monad  In case of query parameters  the parameter is not part of the resource path  In case of  users id 9  the response should be 204 because the resource  users was found but it could not return any data  The resource  users exists and the result is n-ary  it exists even if it is empty  If id is unique  this is a monad    Whether to use path parameters or query parameters depends on the use case  I prefer path parameters for mandatory  normative  or identifying arguments and query parameters for optional  non-normative  or attributing arguments  like paging  collation locale and stuff   In a REST API  I would use  users 9 not  users id 9 especially because of the possible nesting to get  child records  like  users 9 ssh-keys 0 to get the first public ssh key or  users 9 address 2 to get the third postal address   I prefer using 404  Here s why    Calls for unary  1 result  and n-ary  n results  methods should not vary for no good reason  I like to have the same response codes if possible  The number of expected results is of course a difference  say  you expect the body to be an object  unary  or an array of objects  n-ary   For n-ary  I would return an array  and in case there are not results  I would not return no set  no document   I would return an empty set  empty document  like empty array in JSON or empty element in XML   That is  it s still 200 but with zero records  There s no reason to put this information on the wire other than in the body  204 is like a void method  I would not use it for GET  only for POST  PUT  and DELETE  I make an exception in case of GET where the identifiers are query parameters not path parameters  Not finding the record is like NoSuchElementException  ArrayIndexOutOfBoundsException or something like that  caused by the client using an id that doesn t exist  so  it s a client error  From a code perspective  getting 204 means an additional branch in the code that could be avoided  It complicates client code  and in some cases it also complicates server code  depending on whether you use entity model monads or plain entities models  and I strongly recommend staying away from entity model monads  it can lead to nasty bugs where because of the monad you think an operation is successful and return 200 or 204 when you should actually have returned something else   Client code is easier to write and understand if 2xx means the server did what the client requested  and 4xx means the server didn t do what the client requested and it s the client s fault  Not giving the client the record that the client requested by id is the client s fault  because the client requested an id that doesn t exist    Last but not least  Consistency   GET  users 9 PUT  users 9 and DELETE  users 9   PUT  users 9 and DELETE  users 9 already have to return 204 in case of successful update or deletion  So what should they return in case user 9 didn t exist  It makes no sense having the same situation presented as different status codes depending on the HTTP method used   Besides  not a normative  but a cultural reason  If 204 is used for GET  users 9 next thing that will happen in the project is that somebody thinks returning 204 is good for n-ary methods  And that complicates client code  because instead of just checking for 2xx and then decoding the body  the client now has to specifically check for 204 and in that case skip decoding the body  Bud what does the client do instead  Create an empty array  Why not have that on the wire  then  If the client creates the empty array  204 is a form of stupid compression  If the client uses null instead  a whole different can of worms is opened

User · Answer

According to the RFC7231 - page59 https   tools ietf org html rfc7231 page-59  the definition of 404 status code response is   6 5 4   404 Not Found    The 404  Not Found  status code indicates that the origin server did    not find a current representation for the target resource or is not    willing to disclose that one exists   A 404 status code does not    indicate whether this lack of representation is temporary or    permanent  the 410  Gone  status code is preferred over 404 if the    origin server knows  presumably through some configurable means  that    the condition is likely to be permanent     A 404 response is cacheable by default  i e   unless otherwise    indicated by the method definition or explicit cache controls  see    Section 4 2 2 of  RFC7234     And the main thing that brings doubts is the definition of resource in the context above  According the same RFC 7231  the definition of resource is   Resources  The target of an HTTP request is called a  resource    HTTP does not    limit the nature of a resource  it merely defines an interface that    might be used to interact with resources   Each resource is    identified by a Uniform Resource Identifier  URI   as described in    Section 2 7 of  RFC7230      When a client constructs an HTTP 1 1 request message  it sends the    target URI in one of various forms  as defined in  Section 5 3 of     RFC7230     When a request is received  the server reconstructs an    effective request URI for the target resource  Section 5 5 of     RFC7230       One design goal of HTTP is to separate resource identification from    request semantics  which is made possible by vesting the request    semantics in the request method  Section 4  and a few    request-modifying header fields  Section 5    If there is a conflict    between the method semantics and any semantic implied by the URI    itself  as described in Section 4 2 1  the method semantics take    precedence    So in my understand 404 status code should not be used on successful GET request with empty result  example  a list with no result for specific filter

User · Answer

In this scenario Ruby on Rails responses with 404 Not Found  404 Not Found is more appropriate

User · Answer

Why not use 410  It suggests the requested resource no longer exists and the client is expected to never make a request for that resource  in your case users 9   You can find more details about 410 here  https   www w3 org Protocols rfc2616 rfc2616-sec10 html

User · Answer

I d say  neither is really appropriate  As has been said     e g  by  anneb  I  too  think that part of the problems arises from using an HTTP response code to transport a status relating to a RESTful service  Anything the REST service has to say about its own processing should be transported by means of REST specific codes  1 I d argue that  if the HTTP server finds any service that is ready to answer a request it was sent  it should not respond with an HTTP 404     in the end  something was found by the server     unless told so explicitly by the service that processes the request  Let s assume for a moment the following URL  http   example com service return test   Case A is that the server is    simply looking for the file on the file system     If it is not present  404 is correct  The same is true  if it asks some kind of service to deliver exactly this file and that service tells it that nothing of that name exists  In case B  the server does not work with    real    files but actually the request is processed by some other service     e g  some kind of templating system  Here  the server cannot make any claim about the existence of the resource as it knows nothing about it  unless told by the service handling it    Without any response from the service explicitly requiring a different behaviour  the HTTP server can only say 3 things   503 if the service that is supposed to handle the request is not running or responding  200 otherwise as the HTTP server can actually satisfy the request     no matter what the service will say later  400 or 404 to indicate that there is no such service  as opposed to    exists but offline     and nothing else was found   2 To get back to the question at hand  I think the cleanest approach would be to not use an HTTP any response code at all other than said before  If the service is present and responding  the HTTP code should be 200  The response should contain the status the service returned in a separate header     here  the service can say  REST EMPTY e g  if it was asked to search for sth  and that research returned empty  REST NOT FOUND if it was asked specifically for sth     ID-like        be that a file name or a resource by ID or entry No  24  etc      and that specific resource was not found  usually  one specific resource was requested and not found   REST INVALID if any part of the request it was sent is not recognized by the service    note that I prefixed these with    REST     on purpose to mark the fact that while these may have the same values or wording as do HTTP response codes  they are sth  completely different  3 Let s get back to the URL above and inspect case B where service indicates to the HTTP server that it does not handle this request itself but passes it on to SERVICE  HTTP only serves out what it is handed back by SERVICE  it does not know anything about the return test portion as that is handeled by SERVICE  If that service is running  HTTP should return 200 as it did indeed find something to handle the request  The status returned by SERVICE  and which  as said above  would like to see in a separate header  depends on what action is actually expected   if return test asks for a specific resource  if it exists  return it with a status of REST FOUND  if that resource does not exist  return REST NOT FOUND  this could be extended to return REST GONE if we know it once existed and will not return  and REST MOVED if we know it has gone hollywood if return test is considered a search or filter-like operation  if the result set is empty  return an empty set in the type requested and a status of REST EMPTY  a set of results in the type requested and a status of REST SUCCESS if return test is not an operation recogized by SERVICE  return REST ERROR if it is completely wrong  e g  a typo like retrun test   or REST NOT IMPLEMENTED in case it is planned for later   4 This distinction is a lot cleaner than mixing the two different things up  It will also make debugging easier and processing only slightly more complex  if at all   If an HTTP 404 is returned  the server tells me     I have no idea what you re talking about     While the REST portion of my request might be perectly okay  I m looking for par Mach in all the wrong places  On the other hand  HTTP 200 and REST ERR tells me I got the service but did something wrong in my request to the service  From HTTP 200 and REST EMPTY  I know that I did nothing wrong     right server  the server found the service  right request to the service     but the search result is empty   Summary The problem and discussion arises from the fact that HTTP response codes are being used to denote the state of a service whose results are served by HTTP  or to denote sth  that is not in the scope of the HTTP server itself  Due to this discrepancy  the question cannot be answered and all opinions are subject to a lot of discussion  The state of a request processed by a service and not the HTTP server REALLY SHOULD NOT  RFC 6919  be given by an HTTP response code  The HTTP code SHOULD  RFC 2119  only contain information the HTTP server can give from its own scope  namely  whether the service was found to process the request or not  Instead  a different way SHOULD be used to tell a consumer about the state of the request to the service that is actually processing the request  My proposal is to do so via a specific header  Ideally  both the name of the header and its contents follow a standard that makes it easy for consumers to work with theses responses

User · Answer

After looking in question  you should not use 404 why   Based on RFC 7231 the correct status code is 204  In the anwsers above I noticed 1 small missunderstanding   1 - the resource is   users  2 -  users 8 is not the resource  this is  the resource  users with route parameter 8  consumer maybe cannot notice it and does not know the difference  but publisher does and must know this     so he must return an accurate response for consumers  period   so   Based on the RFC  404 is incorrect because the resources  users is found  but the logic executed using the parameter 8 did not found any content to return as a response  so the correct answer is  204  The main point here is  404 not even the resource was found to process the internal logic  204 is a  I found the resource  the logic was executed but I did not found any data using your criteria given in the route parameter so I cant return anything to you  Im sorry  verify your criteria and call me again   200  ok i found the resource  the logic was executed  even when Im not forced to return anything  take this and use it at your will   205   the best option of a GET response  I found the resource  the logic was executed  I have some content for you  use it well  oh by the way if your are going to share this in a view please refresh the view to display it   Hope it helps

User · Answer

Twitter uses 404 with a custom error message like  No data found    Ref  https   developer twitter com en docs basics response-codes html

User · Answer

Encode the response content with a common enum that allows the client to switch on it and fork logic accordingly  I m not sure how your client would distinguish the difference between a  data not found  404 and a  web resource not found  404  You don t want someone to browse to userZ 9 and have the client wonder off as if the request was valid but there was no data returned

User · Answer

Such things can be subjective and there are some interesting and various solid arguments on both sides  However  in my opinion  returning a 404 for missing data is not correct  Here s a simplified description to make this clear    Request  Can I have some data please  Resource  API endpoint   I ll get that request for you  here  sends a response of potential data    Nothing broke  the endpoint was found  and the table and columns were found so the DB queried and data was  successfully  returned     Now - whether that  successful response  has data or not does not matter  you asked for a response of  potential  data and that response with  potential  data was fulfilled  Null  empty etc is valid data     200 just means whatever request we did was successful  I m requesting data  nothing went wrong with HTTP REST  and as data  albeit empty  was returned my  request for data  was successful   Return a 200 and let the requester deal with empty data as each specific scenario warrants it   Consider this example    Request  Query  infractions  table with user ID 1234 Resource  API endpoint   Returns a response but data is empty   This data being empty is entirely valid  It means that user has no infractions  This is a 200 as it s all valid  as then I can do      You have no infractions  have a blueberry muffin    If you deem this a 404 what are you stating  The user s infractions couldn t be found  Now  grammatically that is correct  but it s just not correct in REST world were the success or failure is about the request  The  infraction  data for this user could be found successfully  there are zero infractions - a real number representing a valid state      Cheeky note      In your title  you re subconsciously agreeing that 200 is the correct response      What is the proper REST response code for a valid request but an empty data      Here are some things to consider when choosing which status code to use  regardless of subjectivity and tricky choices    Consistency  If you use 404 for  no data  use it every time a response is returning no data  Don t use the same status for more than one meaning  If you return 404 when a resource was not found  eg API end point does not exist etc  then don t also use it for no data returned  This just makes dealing with responses a pain  Consider the context carefully  What is the  request   What are you saying you are trying to achieve

User · Answer

In previous projects  I ve used 404   If there s no user 9  then the object was not found   Therefore 404 Not Found is appropriate   For object exists  but there is no data  204 No Content would be appropriate   I think in your case  the object does not exist though

User · Answer

According to Microsoft  Controller action return types in ASP NET Core web API  scroll down almost to the bottom  you find the following blurb about 404 relating to an object not found in the database  Here they suggest that a 404 is appropriate for Empty Data

User · Answer

TL DR   If no user is found at  users 9  you should return a 404  If no user is found at  users id 9  you should return a 204   Long Version  After reviewing my own usage of these status codes and the examples on this post  I would have to say that 404 is the appropriate response if User  9 was Not Found at the url of  users 9  In my system today  our Application Insights logs are filled with hundreds of logged 404 errors that muddy up our logs all because we decided to return 404 s when  users 9 had no correlating data  However  this does not mean our approach was incorrect when setting up our responses  rather  I would propose that it means our approach was incorrect when setting up our routing  If you re expecting an endpoint to get a lot of traffic and are concerned about logging too many 404 errors  you should change your routing to fall in line with the status code you want  not force a status code to be inappropriately used  We ve since decided to make 2 changes to our code   Change our route to work by expecting  users id 9 Change our error code to 204 so that the 404 s don t fill our AI logs   At the end of the day  the architect of the API needs to understand how their API will be used and what kind of routing will be appropriate for that use case  I believe that in the case of  users 9  the resource you are requesting is the user itself  User  9  you are asking the server to respond with an object identified as  quot 9 quot  that happens to exist in a path that has the word  user  in it  If that object was not found  you should get a 404  However  if you call  users id 9  I feel that the resource you are requesting is the Users controller while also providing a bit more specificity so that it doesn t return a full list of all users  You are asking the server to respond with a specific user who can be identified by an ID number defined in the query string  Thusly  if no data was found  it makes sense to me that a 204 would be applicable because even if no data was found  the controller was  The query string approach also accomplishes something that I think helps not only the API developers but also the client developers  especially junior developers or future developers who inherit this code  or code that makes calls to it   It becomes immediately clear to anyone involved that 9 is an ID  not some arbitrary number  This point may seem moot in such a basic example  but consider a system that uses GUIDs as row ID s or allows you to get data by a person s name  or even a system that is returning info for specific ZIP postal codes instead of row ID s  It would be useful for all developers involved if  at a glance  they knew whether that identifying parameter was a first  last  full name  or a ZIP postal code instead of an ID

User · Answer

According to w3 post      200 OK     The request has succeeded  The information returned with the response is dependent on the method used in the request     202 Accepted   The request has been accepted for processing  but the processing has not been completed      204 No Content   The server has fulfilled the request but does not need to return an entity-body  and might want to return updated metainformation      400 Bad Request    The request could not be understood by the server due to malformed syntax  The client SHOULD NOT repeat the request without modifications     401 Unauthorized        The request requires user authentication  The response MUST include a WWW-Authenticate header field      404 Not Found   The server has not found anything matching the Request-URI  No indication is given of whether the condition is temporary or permanent

[rest] What is the proper REST response code for a valid request but an empty data?

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