Firstly : Use an object instead of new Headers(..):

fetch('www.example.net', {
  method: 'POST',
  headers: {
    'Content-Type': 'text/plain',
    'X-My-Custom-Header': 'value-v',
    'Authorization': 'Bearer ' + token,
  }
});

Secondly : Good to know, headers are lowercased by fetch!!

Thridly : no-cors mode limite the use of headers to this white list :

• Accept
• Accept-Language
• Content-Language
• Content-Type and whose value is ( application/x-www-form-urlencoded, multipart/form-data, text/plain )

That's why only your Content-Type header is sent and not X-My-Custom-Header or Authorization.

Firstly : Use an object instead of new Headers(..):

fetch('www.example.net', {
  method: 'POST',
  headers: {
    'Content-Type': 'text/plain',
    'X-My-Custom-Header': 'value-v',
    'Authorization': 'Bearer ' + token,
  }
});

Secondly : Good to know, headers are lowercased by fetch!!

Thirdly : no-cors mode limits the use of headers to this white list :

• Accept
• Accept-Language
• Content-Language
• Content-Type and whose value is ( application/x-www-form-urlencoded, multipart/form-data, text/plain )

That's why only your Content-Type header is sent and not X-My-Custom-Header or Authorization.

Firstly : Use an object instead of new Headers(..):

fetch('www.example.net', {
  method: 'POST',
  headers: {
    'Content-Type': 'text/plain',
    'X-My-Custom-Header': 'value-v',
    'Authorization': 'Bearer ' + token,
  }
});

Secondly : Good to know, headers are lowercased by fetch!!

Firstly : Use an object instead of new Headers(..):

fetch('www.example.net', {
  method: 'POST',
  headers: {
    'Content-Type': 'text/plain',
    'X-My-Custom-Header': 'value-v',
    'Authorization': 'Bearer ' + token,
  }
});

Secondly : Good to know, headers are lowercased by fetch!!

Thridly : no-cors mode limite the use of headers to this white list :

• Accept
• Accept-Language
• Content-Language
• Content-Type and whose value is ( application/x-www-form-urlencoded, multipart/form-data, text/plain )

That's why only your Content-Type header is sent and not X-My-Custom-Header or Authorization.