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Client Error (4xx)

HTTP 401 — 401 Unauthorized

Similar to 403 Forbidden, but specifically for use when authentication is required and has failed or has not yet been provided. (İstenen kaynağa erişmek için geçerli bir kimlik doğrulaması (Bearer Token, API Key, Cookie) gereklidir.)

Yaygın Nedenler / Common Causes
  • •Missing Authorization header in HTTP request.
  • •Expired or invalid JWT (JSON Web Token).
  • •Incorrect API key or credentials provided.
Spesifikasyon & Kategori
Status Code:401
Category:Client Error (4xx)
RFC Standard:RFC 9110 / HTTP/1.1 & HTTP/2
Nasıl Düzeltilir / Practical Code Solutions

Check and Attach Bearer Token

Ensure authorization header is set in fetch or axios client requests.

fetch('/api/protected', {
  headers: {
    'Authorization': 'Bearer ' + userToken
  }
});
Diğer Popüler HTTP Durum Kodları
200201204301302400403404429500502503
Frequently Asked Questions

Common Questions About HTTP 401 to RFC Standard

Everything you need to know regarding AST transformations, typing rules, and browser security.

Similar to 403 Forbidden, but specifically for use when authentication is required and has failed or has not yet been provided. In Turkish: İstenen kaynağa erişmek için geçerli bir kimlik doğrulaması (Bearer Token, API Key, Cookie) gereklidir.