Error code 422 (Unprocessable Entity) is returned by Ionic 2 when making a POST request

After testing my API in Postman, I found that it works fine with the following data:

URL: http://{URL}/password/email

Method: POST

Header:

[{"key":"Accept","value":"application/json","description":""}
,{"key":"Content-Type","value":"application/x-www-form-urlencoded","description":""}]

Body: The API only works when key:value pairs are sent in x-www-form-urlencoded format.

In my IONIC 2 code:

return new Promise((resolve, reject) => {
let headers = new Headers();
headers.append('Accept', 'application/json');
headers.append('Content-Type', 'application/x-www-form-urlencoded');
let body = new FormData();
body.append('email', email);
let options = new RequestOptions({ headers: headers });

this.http.post(config.API_URL+"/password/email" ,body, options)
.subscribe(res => {
resolve(res.json());
}, (err) => {
reject(err.json());
});
}); 

However, when I try to execute the code, I encounter an error:

POST {URL}/password/email 422 (Unprocessable Entity)  polyfills.js:3 

I'm unsure of what is causing this issue in my code. Can someone help me troubleshoot?

Answer №1

Check out the code snippet below. Where is the emailId variable being referenced from? If it's a global variable, make sure to use this.emailId.

The Content-Type header in an HTTP request or response specifies the type of content present in the message body.

The Accept header in a request informs the server about the expected content types that the client wishes to receive in the response body.

Make sure to consult the API documentation to understand the data format that is anticipated and the data type that will be sent.


return new Promise((resolve, reject) => {
   let headers = new Headers();
   headers.append('Content-Type', 'application/json');
   
   let body = JSON.stringify({
     "emailId": this.emailId
   });

   let options = new RequestOptions({ headers: headers });

   this.http.post(config.API_URL+"/password/email", body, options)
     .subscribe(res => {
       resolve(res.json());
     }, (err) => {
       reject(err.json());
     });
});

Answer №2

I encountered a similar issue with Laravel APIs, which could stem from two potential sources.

  • The problem may lie in the absence of your Authorization token. Ensure that you include Authorization in the headers:

    let headers = new Headers();
       headers.append('Accept', 'application/json');
       headers.append('Content-Type', 'application/x-www-form-urlencoded');
       // Remember to add the Authorization token to your headers
       headers.append("Authorization:", token);


  • You might be overlooking the inclusion of certain fields or objects in your request. Take a moment to review the code descriptions below

Code ... Description

200 ...... OK
400 ...... Inverse Request. The request is invalid in general.
401 ...... Unauthorized. The user and password or access token are invalid.
403 ...... Forbidden. API access is blocked or the user is blocked.
404 ...... not found. The access address does not exist.
422 ...... Non-Processable Entity. The request is valid, but the data passed is not valid.
429 ...... Many requests. The user has reached the request limit.
500 ...... Internal Server. Error An internal server error occurred while processing a request

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