Im trying to pass a string to an api method in flutter.
This is my api method format:
[HttpPut]
public async Task<ActionResult> PutInterests(string value)
{ .....}
This is my flutter request knowing that value is a string:
final response = await client.put(
"http://"+base+":8070/api/Connectors",
headers: {"content-type": "application/json"},
body:json.encode(value)
);
I am continuously getting internal server error (500).
Note that im sure the url is correct and there is no other put method in the controller. Also, the string received is either null or empty based on my code inside the api method.
Any help is appreciated.
Related
I am developing a front-end web application using Angular 11. This application uses several services which return data in JSON format.
I use the async / await javascript constructs and the Observables to get the answers from these services. This is an example my call:
let myResponse = await this.myService(this.myData);
myResponse.subscribe(
res => {
console.log("Res: ",res)
}, (error) => {
console.log("Error: ",error)
}
);
where this.myService contains the code doing the HTTP call using Angular httpClient.
Unfortunately a specific service (only one!) doesn't return data in JSON format but it returns a byte array (string that identifies a pdf -format application/pdf-).
Unfortunately this invocation causes a very strange error with code 200 OK:
How can I do to prevent res from being interpreted as JSON and therefore this error being reported? How can I read resreporting that it will not be in json format?
This service has no errors (with Postman it works perfectly). The problem is Javascript and Observable which are interpreted as JSON. How can I read the content of res in this case?
If a HTTP API call is not returning a JSON, just provide the proper value in the responseType option:
this.httpClient.get('<URL>', {
responseType: 'arraybuffer'
});
Ref: https://angular.io/api/common/http/HttpClient#description
Spring REST API is responding with following response:
On successful execution : It returns me a response of Text type.
On unsuccessful execution : It returns me JSON error object.
Front-End Service Class :
private detailsURL = 'http://localhost:8080/register';
constructor(private http:HttpClient){}
register(regisDetails): Observable<any>{
return this.http.post(this.detailsURL,regisDetails);
}
Front-End Component Class:
registerUser(){
this.service.register(this.regisForm.value).subscribe(
success => this.successMessage = success,
error => this.errorMessage = error.error.errorMessage
);
}
In case of error I'm getting the error message I'm supposed to get. But in case of success I'm not getting the successMessage.
Just wanted to know if there's any way to fetch the Text type response on front end. Or else I'll have to change my backend to send response of JSON Type for successful execution as well.
Please help me understand this thing.
You have to set the status for your response. In the controller part you have to mention consumes="application/json" in api request.
You should be doing your changes at the backend and provide the response in Json format response for both the success and backend. That would be the ideal solution.
It is really a bad design to provide a different response than what is expected. You could check the value of the header in request "accept:application/json" and provide response as was expected by the front end
Front End Fix :
However, in the front end you could always use
JSON.parse(success) to convert the text to Json object and use it further as required.
I'm using axios to send a JSON object as a parameter to my api. Before it post request is fired, my data starts of as a JSON object. On the server side, when I console.log(req.params) the data is returned as such
[object Object]
When I used typeof, it returned a string. So then I went to use JSON.parse(). However, when I used that, it returned an error as such
SyntaxError: Unexpected token o in JSON at position 1
I looked for solutions, but nothing I tried seemed to work. Now I'm thinking I'm sending the data to the server incorrectly.
Here's my post request using axios:
createMedia: async function(mediaData) {
console.log("SAVING MEDIA OBJECT");
console.log(typeof mediaData)
let json = await axios.post(`http://localhost:3001/api/media/new/${mediaData}`)
return json;
}
Any thoughts on how I can solve this?
You need to update your code using axios to provide the mediaData in the body of the request instead of the URL:
createMedia: async function(mediaData) {
console.log("SAVING MEDIA OBJECT");
console.log(typeof mediaData)
let json = await axios.post(`http://localhost:3001/api/media/new/`, mediaData)
return json;
}
In the backend (assuming you're using express here), you need to configure your application to use bodyParser:
var express = require('express')
, app = express.createServer();
app.use(express.bodyParser());
And then in your controller update your console.log(req.params) to console.log(req.body); then restart your node server
Newb to writing Web Services. Am using C#/ASP.Net with WebAPI. End goal is to receive JSON collection, and deserialize the data to database, and inform client application of any failed records, which client will log.
Can the HTTPPost return a collection of the failed rows (as serialized Json) through an IHttpActionResult or HttpResponseMessage, kind of like this:
[HttpPost]
public HttpResponseMessage Post([FromBody]List<Things> t)
{
// deserialize t and process to database
// list of failed records
ICollection<Thing> things= new List<Thing>();
things.Add(...);
things.Add(...);
string jsonFailedRows =
JsonConvert.SerializeObject(things, Formatting.Indented);
// Write the list to the response body
HttpResponseMessage response =
Request.CreateResponse(HttpStatusCode.OK, jsonFailedRows);
return response;
}
I saw this link: StackOverFlow, which says the I can do the following, but is this correct for a Post?
"The latter is done for you if you call the ApiController.Ok() method:
return Ok(jsonFailedRows);
And lastly, is there any way of using CreatedAtRoute to do so?
The solution posted in the linked response indeed answers this question.
I'm new to Grails and I'm stuck up with a problem. I want to know if there is a way to send both JSON and view and model through "render" in Grails.
I'm using a jQuery Datatable to display data returned from server which is read from JSON returned by the controller. I also need to display error messages on the same view in case of validation failure in form fields. But I'm able to return either only the JSON or model and view using render. I also tried sending the JSON through model itself but it didn't work.
This is my code:-
def hierarchyBreakInstance = new HierarchyBreak(params);
String json = "{\"sEcho\":\"1\",\"iTotalRecords\":0,\"iTotalDisplayRecords\":0,\"aaData\":[]}";
hierarchyBreakInstance.errors.reject(message(code: 'hierarchyBreak.error.division.blank'));
render(view: "hierarchyBreak", model: [hierarchyBreakInstance: hierarchyBreakInstance]);
//render json;
The gsp code:-
<g:hasErrors bean="${hierarchyBreakInstance}">
<div class="errorMessage" role="alert">
<g:eachError bean="${hierarchyBreakInstance}" var="error">
<g:if test="${error in org.springframework.validation.FieldError}" > data-field-id="${error.field}"</g:if>
<g:message error="${error}"/>
</g:eachError>
</div>
</g:hasErrors>
Could you please let me know if there is a way to do this. Thanks!
You can use like this.
def hierarchyBreakInstance = new HierarchyBreak(params);
String json = "{\"sEcho\":\"1\",\"iTotalRecords\":0,\"iTotalDisplayRecords\":0,\"aaData\":[]}";
hierarchyBreakInstance.errors.reject(message(code: 'hierarchyBreak.error.division.blank'));
render(view: "hierarchyBreak", model: [hierarchyBreakInstance: hierarchyBreakInstance,json:json]);
//render json;
Assuming that you are doing a request with some parameters, and need to return if was succesfull or not, and the data to fill the table with ajax.
I will do on that way, use the statuses of the HTTP to mark if it was a problem with the validation(normally we return 400 Bad Request and the message)
Example :
return ErrorSender.sendBadRequest("error validating field $field with value $value")
And the errorsender has a sendBadRequest method
[response: ['message': message, error: "bad_request", status: 400, cause: []], status: 400]
If the request was OK, you only need to respond the data with something like
return [response: results, status: 200]
In the client side you have to have one function if the request was OK to parse result, and one function if request have some validated data problem, database problem or whatever that caused that the request didn´t return a 200(in the example),there are more status codes, you can check on
http://en.wikipedia.org/wiki/List_of_HTTP_status_codes
PD: Initial validation should be done on client side.