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JS translate XMLHttpRequest to Fetch-function (GET): Failed to execute 'fetch' on 'Window': Request with GET/HEAD method cannot have body

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0

0

How to convert old XMLHttpRequest based code to FETCH function?
An old code:

var data = JSON.stringify(
 "username": "user",
 "token": "12345"
);
var xhr = new XMLHttpRequest();
xhr.withCredentials = true;
xhr.open("GET", "http://localhost:5000/v1/data/users/");
xhr.setRequestHeader("Content-Type", "application/json");
xhr.send(data);

I can't send data-fields thro GET request

I have tryed:

fetch (url, method: 'GET',
 mode:"cors",
 body: JSON.stringify(
 username,
 token
 ),
 headers: 
 'Content-Type': 'application/json'
 
 )

but i have caught Fetch Error: TypeError: Failed to execute 'fetch' on 'Window': Request with GET/HEAD method cannot have body.

get xmlhttprequest fetch

share|improve this question

edited Mar 23 at 0:50

sideshowbarker

34.6k1684100

asked Mar 22 at 16:47

Gerasim GerasimovGerasim Gerasimov

13

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  It seems like the error message is pretty clear: GET requests can’t have a request body, but your code is trying to send a GET request with an application/json request body. Why are you trying do that? Why aren’t you just using a POST request instead?
  
  – sideshowbarker
  Mar 23 at 0:51
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Using the POST-request have to lead change back-end legacy code, it is not in my competence. If i will have not solved at next week with FETCH-function, i will code a Promise-wrapper around XMLHttpRequest
  
  – Gerasim Gerasimov
  Mar 23 at 4:35
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Have you got an idea, how the POSTMAN doing that? get-header. get-body.
  
  – Gerasim Gerasimov
  Mar 24 at 6:58
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Postman is able to send GET requests that have a request body because like other general HTTP clients there are no restrictions on the characteristics of HTTP requests it can make. But the the case of the Fetch API, the Fetch spec places an explicit restriction on what kind of GET requests you can make with the API. See fetch.spec.whatwg.org/#ref-for-dom-requestinit-body%E2%91%A0: “If either init["body"] exists and is non-null or inputBody is non-null, and request’s method is GET or HEAD, then throw a TypeError.”
  
  – sideshowbarker
  Mar 24 at 9:45
  
  

  
  
  
  

add a comment | 

0

0

How to convert old XMLHttpRequest based code to FETCH function?
An old code:

var data = JSON.stringify(
 "username": "user",
 "token": "12345"
);
var xhr = new XMLHttpRequest();
xhr.withCredentials = true;
xhr.open("GET", "http://localhost:5000/v1/data/users/");
xhr.setRequestHeader("Content-Type", "application/json");
xhr.send(data);

I can't send data-fields thro GET request

I have tryed:

fetch (url, method: 'GET',
 mode:"cors",
 body: JSON.stringify(
 username,
 token
 ),
 headers: 
 'Content-Type': 'application/json'
 
 )

but i have caught Fetch Error: TypeError: Failed to execute 'fetch' on 'Window': Request with GET/HEAD method cannot have body.

get xmlhttprequest fetch

share|improve this question

edited Mar 23 at 0:50

sideshowbarker

34.6k1684100

asked Mar 22 at 16:47

Gerasim GerasimovGerasim Gerasimov

13

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  It seems like the error message is pretty clear: GET requests can’t have a request body, but your code is trying to send a GET request with an application/json request body. Why are you trying do that? Why aren’t you just using a POST request instead?
  
  – sideshowbarker
  Mar 23 at 0:51
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Using the POST-request have to lead change back-end legacy code, it is not in my competence. If i will have not solved at next week with FETCH-function, i will code a Promise-wrapper around XMLHttpRequest
  
  – Gerasim Gerasimov
  Mar 23 at 4:35
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Have you got an idea, how the POSTMAN doing that? get-header. get-body.
  
  – Gerasim Gerasimov
  Mar 24 at 6:58
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Postman is able to send GET requests that have a request body because like other general HTTP clients there are no restrictions on the characteristics of HTTP requests it can make. But the the case of the Fetch API, the Fetch spec places an explicit restriction on what kind of GET requests you can make with the API. See fetch.spec.whatwg.org/#ref-for-dom-requestinit-body%E2%91%A0: “If either init["body"] exists and is non-null or inputBody is non-null, and request’s method is GET or HEAD, then throw a TypeError.”
  
  – sideshowbarker
  Mar 24 at 9:45
  
  

  
  
  
  

add a comment | 

How to convert old XMLHttpRequest based code to FETCH function?
An old code:

var data = JSON.stringify(
 "username": "user",
 "token": "12345"
);
var xhr = new XMLHttpRequest();
xhr.withCredentials = true;
xhr.open("GET", "http://localhost:5000/v1/data/users/");
xhr.setRequestHeader("Content-Type", "application/json");
xhr.send(data);

I can't send data-fields thro GET request

I have tryed:

fetch (url, method: 'GET',
 mode:"cors",
 body: JSON.stringify(
 username,
 token
 ),
 headers: 
 'Content-Type': 'application/json'
 
 )

but i have caught Fetch Error: TypeError: Failed to execute 'fetch' on 'Window': Request with GET/HEAD method cannot have body.

get xmlhttprequest fetch

share|improve this question

edited Mar 23 at 0:50

sideshowbarker

34.6k1684100

asked Mar 22 at 16:47

Gerasim GerasimovGerasim Gerasimov

13

var data = JSON.stringify(
 "username": "user",
 "token": "12345"
);
var xhr = new XMLHttpRequest();
xhr.withCredentials = true;
xhr.open("GET", "http://localhost:5000/v1/data/users/");
xhr.setRequestHeader("Content-Type", "application/json");
xhr.send(data);

fetch (url, method: 'GET',
 mode:"cors",
 body: JSON.stringify(
 username,
 token
 ),
 headers: 
 'Content-Type': 'application/json'
 
 )

share|improve this question

edited Mar 23 at 0:50

sideshowbarker

34.6k1684100

asked Mar 22 at 16:47

Gerasim GerasimovGerasim Gerasimov

13

share|improve this question

edited Mar 23 at 0:50

sideshowbarker

34.6k1684100

asked Mar 22 at 16:47

Gerasim GerasimovGerasim Gerasimov

13

edited Mar 23 at 0:50

sideshowbarker

34.6k1684100

edited Mar 23 at 0:50

sideshowbarker

34.6k1684100

asked Mar 22 at 16:47

Gerasim GerasimovGerasim Gerasimov

13

asked Mar 22 at 16:47

Gerasim GerasimovGerasim Gerasimov

13