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Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Already on GitHub? Sign in to your account. Angular version: Typescript needs to be able to responsetype angular js the observe and responseType values statically, in order to choose the correct return type for get. If you pass in an improperly typed options object, it can't infer the right return type. I understand, but I believe that's unintuitive and confusing to the developers.
I don't recall I ever casted a string to a 'string' before. Enumerating and using types as suggested would sound to me as a cleaner solution. What is the type of res? It depends on the values in options - but Typescript has no way to know responsetype angular js those values are if it's not white oriental lilies. This way Typescript can infer the return type based on the responsetype angular js and the value of responseTypebut options can also be passed in without reconstructing the whole object.
So instead we have to do workarounds responsetype angular js get the desired effect? That can't be the way to go about this. I've been screaming at my computer for quite a while over this now, I've got a service which wraps the HttpClient but trying to set responseType happy go lovely work, the only way that I can get the error to go away is by doing responseType: None of the workarounds above works.
Why are you casting it to json? My approach works, and I can confirm that it is now run on production. This is what I have:. Attempting to add responseType: The only way I got it to work without error was using roddy 's example, and that's with inlined options This does not work: The generic MUST not be used when responseType is specified to something other than json because typeof T will then be inferred automatically. This makes perfect sense since the type can only be something angular does not know statically when the responseType is json - all other cases there is no need for a generic.
However, no matter how I try I cannot make the new HttpClient to work in a service that I am using to intercept image urls in my app:. Neither responseType: Of course, removing the generic means that the whole thing needed to be changed to: While I find the responsetype angular js to this to only be a minor annoyance it was really furustring that it was so difficult to actually find this answer. It'd be nice if this was better documented or I suppose a more intuitive solution be reached.
You don't need to say 'text' as 'text'Typescript knows that. The only time you should be passing a type parameter to an HttpClient method is with responseType: All of the others are implicit. Also knowing that the generic is intended for json responses only helps. I appreciate the follow up. All feels very convoluted to me. I'd rather have different methods to call for different results rather than the inference which is currently being used. Pastafarian I agree, in one case I see with the same responseType option that:.
Not sure I agree this httpclient is any easier or more intuitive than the previous incarnation. On the contrary it's clunky and relies on a lot of under the covers inference. This is not responsetype angular js documented at all https: Seeing stuff like responseType: Maybe the whole Http options object should have been a well-defined interface with explicit enum types.
The type of the field in the interface would be the enum type, not the particular value. HttpClient 's type inference depends on the type of the object being passed to get being narrowed to a specific value type. Responsetype angular js, you just have to responsetype angular js the responseType and observe values directly in the call to get. Everything else can go in the options object.
But it then serves a page and it works fine in the browser HttpHeaders; responseType: Answer that this is by design is not really a good answer it looks like a poor design to me if I can create HttpRequest where that param works as expected I'd expect it to work the same everywhere. Taking that docs don't mention this hacky approach anywhere. Granted I am new to TypeScript but it just doesn't seem right I have to resolve to workarounds like this is this a TypeScript issue or Angular?
I've spent the better part of a day on trying to figure responsetype angular js why postman gave the correct response and http. I thought using http: Eventually I found this thread, saw that I had to take the out and use responseType: Then I read to the end of the post and found that it is still a problem. I think this should be fixed, or at the very least documented because it's far from intuitive! What I did in case of blob type it works fine with no error in Angular 6.
I tried with both responseType: I had the same problem. After a half an hour of trying to implement some of responsetype angular js suggestions above I wen't fmpro migrator with responsetype angular js following dirty but Skip to content. Dismiss Join GitHub today GitHub is home to over 31 million developers working together to host and review code, manage projects, and build software together.
Sign up. New issue. Copy link Quote reply. I'm submitting a Type 'string' is not assignable to type '"json"'. Otherwise the type cannot be changed. Environment Angular version: This comment has been minimized. Sign in to view. A workaround: HttpHeaders, observe?: HttpParams, reportProgress?: Another workaround is: This is what I have: Use responseType: I have already tried all of the above: Eg this does not work responsetype angular js returns the error: Angular v4.
HttpHeaders ; observe?: HttpParams responsetype angular js reportProgress?: However, no matter how I try I cannot make the new HttpClient to work in a service that I am using to intercept image urls in my app: POst Options modified … Modified option observe from 'response' to 'reponse' as 'response'. Static typing issues POst Options modified Modified option observe from 'response' to 'reponse' as 'response'.
Closing, the responsetype angular js is to pass a correctly typed argument. For blobs: So whoever won the argument to re-factor Http to HttpClient this way is just wrong. HttpHeaders; observe: Types of property 'observe' are incompatible. Type 'string' is not assignable to type '"body"'. Pastafarian I agree, in one case I see with the same responseType option that: There's an easy solution to all this, though: Please mention this in: Types of property 'responseType' are incompatible.
Type '"text"' is not assignable to type '"json"'.
ajax - How to specify dataType: 'json' in ardanyan.de $ardanyan.de? - Stack Overflow
How to specify dataType: Ask Question. Paul Paul By default, Angular applies these transformations: Request transformations: Response transformations: Musa Musa The URL is always the same. Paul are you talking about responsetype angular js Accept header. Paul so the server reads the request content type to determine the response type?
Jason Aden Jason Aden 2, 1 13 You'll need to setup headers always if you are sending json objects as response responsetype angular js server side. Setup header content-type as json and should works fine. There is no need to set the above because it is the default.
The fact that this helped you, probably indicates that your code was setting the default header someplace else to another value. I had the same problem, responseType: Mulaffer Mulaffer 2 6.
In docs. If the server returns data that is not compatible to the responsetype angular js that was set, the value of response will be null. Sign up or log in Sign up using Google. Sign up using Facebook. Sign responsetype angular js using Email and Password.