My goal is to modify the http response status code and the content that comes with it (not using spring by the way). The current response I'm getting is an HTTP 501 and I would like to modify that response to return an HTTP 200 instead with a custom message.
I've tried using javax.servlet.Filter and found out that that won't work (as far as I know) since I can't modify the response after the filterChain.doFilter() call. I tried redirecting a response using httpResponse.sendError() but didn't work since I'm getting an IllegalStateException telling me about the reponse was already committed or something like that.
I've also tried adding an <error-page>...</error-page> block in my web.xml using a web servlet as the location but apparently that does not work for unsupported methods and invalid headers (tried using a random string as request method; also tried Transfer-Encoding: random as an invalid header); works for invalid uri paths though.
Is there a way to create a general "filter" mechanism where I can modify the response code and message when there's a HTTP error code response?
I have a problem with sending API request via postman or Java lib "io.restassured".
When I do the same action on UI the request returns correct response, but when I try the same thing via postman or java code I get:
401 Bad request Your browser sent an invalid
request.
The java code
public static void main(String[] args) {
String requestUrl = "exampleBaseUrl/app/reports/api/rest/v1/graphs?context=shipper&reports_type=freights";
Response response = RestAssured.given().relaxedHTTPSValidation().header("x-csrf-token", "18ea65e740eb0ddddadf0ef435d92564").
when().
get(requestUrl);
}
I assume something is wrong with the authentication, because in dev tools i can see a Get request for CSRF_token, and it looks like this:
the endpoint for the token:
/login?get_csrf_token
and for this request I get following response:
{"csrf_token":"18ea65e740eb0ddddadf0ef435d92564"}
I am not sure how to solve this, I have also tried to get the token via java code by sending a get request to the token's endpoint /login?get_csrf_token
and this one gets my a HTML response with empty username and password input.
Error 401 means your request isn't authorized.
For authorization, usually while logging in you are given a token, which you will have to keep in your cache/local-memory and whenever you communicate with the server you have to add that in your request header (for your own introduction to the server)
It seems like in your case you can get a token from /login?get_csrf_token after logging in. Note that you don't need authorization for a login service.
Now, after getting token from the server, how to add it as a request header? See REST Assured Documentation
I need to force the client to retry its request (meaning to send the same request one more time). What I'm thinking of is a response with status-code 307 and header Location: <original-url> (that's good enough for now, unless there's a better way).
My question is, from HTTP specification point of view, what is the correct value for Location in this specific context. Or more specifically in Java having request of type HttpServletRequest, which one should I use: getRequestURI (Returns the part of this request's URL from the protocol name up to the query string in the first line of the HTTP request) or getRequestURL (Reconstructs the URL the client used to make the request containing protocol, server name, port number, and server path, but it does not include query string parameters).
Any other suggestion/comment is appreciated.
getRequestURL() returns complete URL used by the client where as getRequestURI() returns just the basic path resides in server.
i am using this technique to redirect with a response status this is my code this is useful:-
httpServletResponse.reset();
httpServletResponse.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
httpServletResponse.setHeader("SERVER-RESPONSE", "bad request");
return;
and also you can set headers in response.
I believe a redirect is the wrong status code in the first place.
Isn't this what 503 is for? (https://www.greenbytes.de/tech/webdav/rfc7231.html#status.503)
I tried to integrate paypal payment gateway into my application.
Simply I am calling java webservice using angularjs get method.
Below the angularjs http get method code
$http({
method : 'GET',
url : 'http://localhost:8080/xxxx/redirect'
}).then(function successCallback(response) {
console.info("success");
});
The Java side code tried is-
#RequestMapping(value = "/redirect", method = RequestMethod.GET, headers = "Accept=application/json")
public ModelAndView method(Payment pPayment) {
String amount=pPayment.getAmount();
String url="https://www.sandbox.paypal.com/cgi-bin/webscr?cmd=_xclick&business=wipro-seller#gmail.com&first_name=smartCity&city=Madurai&state=Tamilnadu&item_name=shirt&amount=10&night_phone_a=9513335437&item_name=shirt&address1=wipro-seller#gmail.com&business=k.tapankumar#gmail.com&quantity=1¤cy=USD";
return new ModelAndView("redirect:" + url);
}
I am calling Paypal test account url from Java server side only, but still I am getting below error
XMLHttpRequest cannot load https://www.sandbox.paypal.com/cgi-bin/webscr?cmd=_xclick&business=wipro-se…o-seller#gmail.com&business=k.tapankumar#gmail.com&quantity=1¤cy=USD. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:8080' is therefore not allowed access.
Kindly Let me know where I did wrong..
You will need to enable cross origin requests (CORS) for your HTTP requests.
Spring Documentation documents on how to enable this really well. Find it here. I suggest you read through it and try it out. If it still doesn't work, post here.
More on CORS here.
You should allow cross origin request from client side as well.
try to run after installing a chrome plugin for cross origin
https://chrome.google.com/webstore/detail/allow-control-allow-origi/nlfbmbojpeacfghkpbjhddihlkkiljbi?hl=en
this is the link for the one which i use.
Also you should change your headers to allow cors like this
Access-Control-Allow-Headers: Content-Type
Access-Control-Allow-Methods: GET, POST, OPTIONS
Access-Control-Allow-Origin: *
I'm building a REST API, but I've encountered a problem.
It seems that accepted practice in designing a REST API is that if the resource requested doesn't exist, a 404 is returned.
However, to me, this adds unnecessary ambiguity. HTTP 404 is more traditionally associated with a bad URI. So in effect we're saying "Either you got to the right place, but that specific record does not exist, or there's no such location on the Internets! I'm really not sure which one..."
Consider the following URI:
http://mywebsite/api/user/13
If I get a 404 back, is that because User 13 does not exist? Or is it because my URL should have been:
http://mywebsite/restapi/user/13
In the past, I've just returned a NULL result with an HTTP 200 OK response code if the record doesn't exist. It's simple, and in my opinion very clean, even if it's not necessarily accepted practice. But is there a better way to do this?
404 is just the HTTP response code. On top of that, you can provide a response body and/or other headers with a more meaningful error message that developers will see.
Use 404 if the resource does not exist. Don't return 200 with an empty body.
This is akin to undefined vs empty string (e.g. "") in programming. While very similar, there is definitely a difference.
404 means that nothing exists at that URI (like an undefined variable in programming). Returning 200 with an empty body means that something does exist there and that something is just empty right now (like an empty string in programming).
404 doesn't mean it was a "bad URI". There are special HTTP codes that are intended for URI errors (e.g. 414 Request-URI Too Long).
As with most things, "it depends". But to me, your practice is not bad and is not going against the HTTP spec per se. However, let's clear some things up.
First, URI's should be opaque. Even if they're not opaque to people, they are opaque to machines. In other words, the difference between http://mywebsite/api/user/13, http://mywebsite/restapi/user/13 is the same as the difference between http://mywebsite/api/user/13 and http://mywebsite/api/user/14 i.e. not the same is not the same period. So a 404 would be completely appropriate for http://mywebsite/api/user/14 (if there is no such user) but not necessarily the only appropriate response.
You could also return an empty 200 response or more explicitly a 204 (No Content) response. This would convey something else to the client. It would imply that the resource identified by http://mywebsite/api/user/14 has no content or is essentially nothing. It does mean that there is such a resource. However, it does not necessarily mean that you are claiming there is some user persisted in a data store with id 14. That's your private concern, not the concern of the client making the request. So, if it makes sense to model your resources that way, go ahead.
There are some security implications to giving your clients information that would make it easier for them to guess legitimate URI's. Returning a 200 on misses instead of a 404 may give the client a clue that at least the http://mywebsite/api/user part is correct. A malicious client could just keep trying different integers. But to me, a malicious client would be able to guess the http://mywebsite/api/user part anyway. A better remedy would be to use UUID's. i.e. http://mywebsite/api/user/3dd5b770-79ea-11e1-b0c4-0800200c9a66 is better than http://mywebsite/api/user/14. Doing that, you could use your technique of returning 200's without giving much away.
That is an very old post but I faced to a similar problem and I would like to share my experience with you guys.
I am building microservice architecture with rest APIs. I have some rest GET services, they collect data from back-end system based on the request parameters.
I followed the rest API design documents and I sent back HTTP 404 with a perfect JSON error message to client when there was no data which align to the query conditions (for example zero record was selected).
When there was no data to sent back to the client I prepared an perfect JSON message with internal error code, etc. to inform the client about the reason of the "Not Found" and it was sent back to the client with HTTP 404. That works fine.
Later I have created a rest API client class which is an easy helper to hide the HTTP communication related code and I used this helper all the time when I called my rest APIs from my code.
BUT I needed to write confusing extra code just because HTTP 404 had two different functions:
the real HTTP 404 when the rest API is not available in the given url, it is thrown by the application server or web-server where the rest API application runs
client get back HTTP 404 as well when there is no data in database based on the where condition of the query.
Important: My rest API error handler catches all the exceptions appears in the back-end service which means in case of any error my rest API always returns with a perfect JSON message with the message details.
This is the 1st version of my client helper method which handles the two different HTTP 404 response:
public static String getSomething(final String uuid) {
String serviceUrl = getServiceUrl();
String path = "user/" + , uuid);
String requestUrl = serviceUrl + path;
String httpMethod = "GET";
Response response = client
.target(serviceUrl)
.path(path)
.request(ExtendedMediaType.APPLICATION_UTF8)
.get();
if (response.getStatus() == Response.Status.OK.getStatusCode()) {
// HTTP 200
return response.readEntity(String.class);
} else {
// confusing code comes here just because
// I need to decide the type of HTTP 404...
// trying to parse response body
try {
String responseBody = response.readEntity(String.class);
ObjectMapper mapper = new ObjectMapper();
ErrorInfo errorInfo = mapper.readValue(responseBody, ErrorInfo.class);
// re-throw the original exception
throw new MyException(errorInfo);
} catch (IOException e) {
// this is a real HTTP 404
throw new ServiceUnavailableError(response, requestUrl, httpMethod);
}
// this exception will never be thrown
throw new Exception("UNEXPECTED ERRORS, BETTER IF YOU DO NOT SEE IT IN THE LOG");
}
BUT, because my Java or JavaScript client can receive two kind of HTTP 404 somehow I need to check the body of the response in case of HTTP 404. If I can parse the response body then I am sure I got back a response where there was no data to send back to the client.
If I am not able to parse the response that means I got back a real HTTP 404 from the web server (not from the rest API application).
It is so confusing and the client application always needs to do extra parsing to check the real reason of HTTP 404.
Honestly I do not like this solution. It is confusing, needs to add extra bullshit code to clients all the time.
So instead of using HTTP 404 in this two different scenarios I decided that I will do the following:
I am not using HTTP 404 as a response HTTP code in my rest application anymore.
I am going to use HTTP 204 (No Content) instead of HTTP 404.
In that case client code can be more elegant:
public static String getString(final String processId, final String key) {
String serviceUrl = getServiceUrl();
String path = String.format("key/%s", key);
String requestUrl = serviceUrl + path;
String httpMethod = "GET";
log(requestUrl);
Response response = client
.target(serviceUrl)
.path(path)
.request(ExtendedMediaType.APPLICATION_JSON_UTF8)
.header(CustomHttpHeader.PROCESS_ID, processId)
.get();
if (response.getStatus() == Response.Status.OK.getStatusCode()) {
return response.readEntity(String.class);
} else {
String body = response.readEntity(String.class);
ObjectMapper mapper = new ObjectMapper();
ErrorInfo errorInfo = mapper.readValue(body, ErrorInfo.class);
throw new MyException(errorInfo);
}
throw new AnyServerError(response, requestUrl, httpMethod);
}
I think this handles that issue better.
If you have any better solution please share it with us.
404 Not Found technically means that uri does not currently map to a resource. In your example, I interpret a request to http://mywebsite/api/user/13 that returns a 404 to imply that this url was never mapped to a resource. To the client, that should be the end of conversation.
To address concerns with ambiguity, you can enhance your API by providing other response codes. For example, suppose you want to allow clients to issue GET requests the url http://mywebsite/api/user/13, you want to communicate that clients should use the canonical url http://mywebsite/restapi/user/13. In that case, you may want to consider issuing a permanent redirect by returning a 301 Moved Permanently and supply the canonical url in the Location header of the response. This tells the client that for future requests they should use the canonical url.
So in essence, it sounds like the answer could depend on how the request is formed.
If the requested resource forms part of the URI as per a request to http://mywebsite/restapi/user/13 and user 13 does not exist, then a 404 is probably appropriate and intuitive because the URI is representative of a non-existent user/entity/document/etc. The same would hold for the more secure technique using a GUID http://mywebsite/api/user/3dd5b770-79ea-11e1-b0c4-0800200c9a66 and the api/restapi argument above.
However, if the requested resource ID was included in the request header [include your own example], or indeed, in the URI as a parameter, eg http://mywebsite/restapi/user/?UID=13 then the URI would still be correct (because the concept of a USER does exits at http://mywebsite/restapi/user/); and therefore the response could reasonable be expected to be a 200 (with an appropriately verbose message) because the specific user known as 13 does not exist but the URI does. This way we are saying the URI is good, but the request for data has no content.
Personally a 200 still doesn't feel right (though I have previously argued it does). A 200 response code (without a verbose response) could cause an issue not to be investigated when an incorrect ID is sent for example.
A better approach would be to send a 204 - No Contentresponse. This is compliant with w3c's description *The server has fulfilled the request but does not need to return an entity-body, and might want to return updated metainformation.*1 The confusion, in my opinion is caused by the Wikipedia entry stating 204 No Content - The server successfully processed the request, but is not returning any content. Usually used as a response to a successful delete request. The last sentence is highly debateable. Consider the situation without that sentence and the solution is easy - just send a 204 if the entity does not exist. There is even an argument for returning a 204 instead of a 404, the request has been processed and no content has been returned! Please be aware though, 204's do not allow content in the response body
Sources
http://en.wikipedia.org/wiki/List_of_HTTP_status_codes
1. http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html
This old but excellent article... http://www.infoq.com/articles/webber-rest-workflow says this about it...
404 Not Found - The service is far too lazy (or secure) to give us a real reason why our request failed, but whatever the reason, we need to deal with it.
This recently came up with our team.
We use both 404 Not found with a message body and 204 No Content based on the following rational.
If the request URI indicates the location of a single resource, we use 404 Not found. When the request queries a URI, we use 204 No Content
http://mywebsite/api/user/13 would return 404 when user 13 does not exist
http://mywebsite/api/users?id=13 would return 204 no content
http://mywebsite/api/users?firstname=test would return 204 no content
The idea here being, 'query routes' are expected to be able to return 1, many or no content.
Whatever pattern you choose, the most important things is to be consistent - so get buy in from your team.
The Uniform Resource Identifier is a unique pointer to the resource. A poorly form URI doesn't point to the resource and therefore performing a GET on it will not return a resource. 404 means The server has not found anything matching the Request-URI. If you put in the wrong URI or bad URI that is your problem and the reason you didn't get to a resource whether a HTML page or IMG.
Since this discussion seems to be able to survive the end of time I'll throw in the JSON:API Specifications
404 Not Found
A server MUST respond with 404 Not Found when processing a request to fetch a single resource that does not exist, except when the request warrants a 200 OK response with null as the primary data (as described above).
HTTP/1.1 200 OK
Content-Type: application/vnd.api+json
{
"links": {
"self": "http://example.com/articles/1/author"
},
"data": null
}
Also please see this Stackoverflow question
For this scenario HTTP 404 is response code for the response from the REST API
Like 400, 401, 404 , 422 unprocessable entity
use the Exception handling to check the full exception message.
try{
// call the rest api
} catch(RestClientException e) {
//process exception
if(e instanceof HttpStatusCodeException){
String responseText=((HttpStatusCodeException)e).getResponseBodyAsString();
//now you have the response, construct json from it, and extract the errors
System.out.println("Exception :" +responseText);
}
}
This exception block give you the proper message thrown by the REST API