Spring-boot RESTful server side; a testing method that will return a string:
@RequestMapping(value = "test", method = RequestMethod.GET)
public ResponseEntity<String> test(HttpServletRequest req, HttpServletResponse resp) {
try {
return new ResponseEntity<String>("Test has worked, biatch!", HttpStatus.OK);
} catch (Exception e) {
System.err.println("## EXCEPTION: " + e.getMessage());
return new ResponseEntity<String>(e.getMessage(), HttpStatus.BAD_REQUEST);
}
}
from Postman- everything works perfectly fine and I get the String returned parsed correctly from JSON.
However, when trying the same from my Angular client-side, I keep getting an HttpErrorResponse object generated.
public url: string = "http://localhost:8080/theater/admin/test";
constructor(private as: AdminService, private http: HttpClient) { }
ngOnInit() {
}
getTest() {
this.as.getTest()
.subscribe(data => console.log(data), // this should happen on success
error => console.log(error)); // this should happen on error
}
funny enough, it contains the String returned from the server, and I can access it with error.text
on the subscribe function.
the Error object on console:
HttpErrorResponse {headers: HttpHeaders, status: 200, statusText: "OK", url: "http://localhost:8080/theater/admin/test", ok: false, …}
error
:
{error: SyntaxError: Unexpected token T in JSON at position 0 at JSON.parse (<anonymous>) at XMLHttp…, text: "Test has worked, biatch!"}
headers
:
HttpHeaders {normalizedNames: Map(0), lazyUpdate: null, lazyInit: ƒ}
message
:
"Http failure during parsing for http://localhost:8080/theater/admin/test"
name
:
"HttpErrorResponse"
ok
:
false
status
:
200
statusText
:
"OK"
url
:
"http://localhost:8080/theater/admin/test"
__proto__
:
HttpResponseBase
This probably has to do with parsing the JSON object returning from the server, containing the String. however, returning objects, collections and whatever else- works totally fine- .subscribe() parses whatever objects I get from the server correctly, or if the server had an exception occurred, the returned HttpStatus correctly invokes an HttpErrorResponse on the client side.
So, what's up with Strings mis-firing like that? I'm always getting an HttpErrorResponse, no matter what. am I doing something wrong here?
HttpErrorResponselink A response that represents an error or failure, either from a non-successful HTTP status, an error while executing the request, or some other failure which occurred during the parsing of the response.
Test has worked, biatch!
This is not a JSON. Thus parsing error.
This probably has to do with parsing the JSON object returning from the server, containing the String. however, returning objects, collections and whatever else- works totally fine- .subscribe()
Well it worked for POJOs besause those are JSON encoded. Here you have plain String
To get response as string instead of object, do something like
http.get(url, {responseType: 'text'})
Try something like this -
{ responseType: 'text' as 'json' }
I was facing the same issue with HttpClient in Angular 7, resolved using the above setup.
The problem is when you use a return type on the get
or post
or any method from httpClient like this-
this.http.get<FooClass>(url)
It assumes that the response type is JSON and thus it expects a JSON object in response. Setting the response type as 'text' as 'json' will force text response.
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