Error map

451 HTTP 451 Unavailable For Legal Reasons

HTTP · layer 2, Network

Centre: this error. First ring: errors it is linked with (8). Outer ring: what those are linked with. Colours show the layer of a request each error belongs to. Click any dot to re-centre the map on it; hover to follow its connections. The centre dot opens the error page.

1 · On your device 2 · Network 3 · Edge & web server 4 · Application & API 6 · Platform & cloud 7 · Build & delivery

Directly related (8)

403HTTP

HTTP 403 Forbidden

The server understood the request but refuses to authorize it — you (or the server process) are not allowed to access this resour…

200HTTP

HTTP 200 OK (but something is still wrong)

The request succeeded at the HTTP level — yet the page is blank, the data is wrong, or an error is hidden inside the response bod…

302HTTP

HTTP 302 Found (Temporary Redirect)

The resource is temporarily at another URL; clients should keep using the original URL for future requests.

1020Cloudflare

Cloudflare Error 1020: Access Denied

A Cloudflare firewall/WAF custom rule blocked the request — the visitor’s IP, country, user agent or request pattern matched a bl…

100HTTP

HTTP 100 Continue

An interim response telling the client to go ahead and send the request body — normal when the client sent Expect: 100-continue.

1009Cloudflare

Cloudflare Error 1009: Access denied — The owner of this website has banned the country or region your IP address is in

The site blocks visitors from your country/region.

103HTTP

HTTP 103 Early Hints

An interim response that sends Link headers early so the browser can preload CSS, fonts or scripts while the server is still buil…

301HTTP

HTTP 301 Moved Permanently

The resource has a new permanent URL; clients and search engines should use the address in the Location header from now on.

Two steps away (24)

publickeyGit

Git: Permission denied (publickey). fatal: Could not read from remote repository.

SSH authentication to GitHub/GitLab/Bitbucket failed — no key, wrong key, or the key isn’t added to your account.

AccessDeniedAWS

AWS S3: AccessDenied (403) when calling GetObject / PutObject

An IAM policy, bucket policy, ACL/ownership setting, Block Public Access or KMS key policy denied the S3 request.

EACCESLinux

Linux: Permission denied

Your user (or the service user) lacks read/write/execute permission on a file, directory or one of its parents.

404HTTP

HTTP 404 Not Found

The server can’t find anything at the requested URL.

SyntaxError: JSONJavaScript

SyntaxError: Unexpected token < in JSON at position 0

`JSON.parse()` / `response.json()` received something that isn’t JSON — very often an HTML error page.

GRAPHQL_VALIDATION_FAILEDAPI

GraphQL: Cannot query field "x" on type "Y"

The query asks for a field that doesn’t exist in the server’s schema (or isn’t available on that type).

401HTTP

HTTP 401 Unauthorized

The request has no valid authentication credentials — you need to log in or send a valid token.

508HTTP

HTTP 508 Loop Detected (Resource Limit Is Reached)

Either the server detected an infinite loop (WebDAV) or — much more often — a cPanel/CloudLinux host is saying your account hit i…

303HTTP

HTTP 303 See Other

A redirect telling the client to fetch the result from another URL with GET — used after a form POST so refreshing doesn’t resubm…

429HTTP

HTTP 429 Too Many Requests

You’ve hit a rate limit — too many requests in a given time window. Slow down and retry later.

520Cloudflare

Cloudflare Error 520: Web Server Returned an Unknown Error

Cloudflare connected to your origin, but the origin returned an empty, unknown or invalid response.

iptables: No chain/target/matchDocker

driver failed programming external connectivity on endpoint: iptables: No chain/target/match by that name

Docker’s iptables rules were wiped (firewalld/ufw reload, iptables flush) while Docker was running, so it can’t publish ports.

413HTTP

HTTP 413 Content Too Large (Request Entity Too Large)

The request body is bigger than the server is willing to accept — usually a file upload over the configured limit.

Headers already sentPHP

Warning: Cannot modify header information - headers already sent

You called `header()`, `setcookie()` or `session_start()` after output had already been sent to the browser.

CORSAPI

CORS Error: No 'Access-Control-Allow-Origin' header is present

The browser blocked a cross-origin request because the server’s response didn’t include the CORS headers allowing your site’s ori…

1005Cloudflare

Cloudflare Error 1005: Access denied — The owner of this website has banned the autonomous system number (ASN) your IP address is in

The site owner blocked your network provider (ASN) — common for VPNs, cloud/data-center IPs and some mobile carriers.

1006Cloudflare