[function.fopen]: failed to open stream: HTTP request failed! HTTP/1.1 401 Unauthorized

Question

[function.fopen]: failed to open stream: HTTP request failed! HTTP/1.1 401 Unauthorized

I am periodically getting this error, i.e it is only happening at random times, a

Answer 1

You are trying to access a site that requires authentication, as maggie pointed out. fopen() does not support HTTP Basic Authentication, so you must use the Client URL Library to achieve such functionalities.

This has been discussed before.

Answer 2

task - fopen with basic http authentication.

$auth_header = 'Authorization: Basic '.base64_encode("$user:$password");

$f = fopen($url, $open_mode,false, stream_context_create(
    'http'=>array(
        'header' => array($auth_header,$some_other_header,$some_yet_header),
    ),
));

Answer 3

If the site requires basic authentication, you can give your credentials this way:

fopen("http://user:pass@www.example.com/path/to/resource", "r");

If it uses digest authentication, you'll have to handle it manually by reading the headers of the failed response and sending a new one with the correct headers. See HTTP context options for how to read and set headers and see how digest works in HTTP authentication with PHP.

You can also use the cURL extension or the HTTP PECL extension.

Answer 4

10.4.2 401 Unauthorized

The request requires user authentication. The response MUST include a WWW-Authenticate header field (section 14.47) containing a challenge applicable to the requested resource. The client MAY repeat the request with a suitable Authorization header field (section 14.8). If the request already included Authorization credentials, then the 401 response indicates that authorization has been refused for those credentials. If the 401 response contains the same challenge as the prior response, and the user agent has already attempted authentication at least once, then the user SHOULD be presented the entity that was given in the response, since that entity might include relevant diagnostic information. HTTP access authentication is explained in "HTTP Authentication: Basic and Digest Access Authentication" [43].

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