HTTP
Telnet access
GET / HTTP/1.1 host: daveops.net <line feed>
Get request headers
curl -i example.com
See if server uses gzip/deflate
curl -I -H 'Accept-Encoding: gzip,deflate' http://example.com
HTTP response codes
1xx Informational
- 100 Continue
- 101 Switching Protocols
- 102 Processing (WebDAV; RFC 2518)
2xx Success
- 200 OK
- 201 Created
- 202 Accepted
- 203 ~Non-Authoritative Information (since HTTP/1.1)
- 204 No Content
- 205 Reset Content
- 206 Partial Content
- 207 ~Multi-Status (WebDAV; RFC 4918)
- 208 Already Reported (WebDAV; RFC 5842)
- 226 IM Used (RFC 3229)
3xx Redirection
- 300 Multiple Choices
- 301 Moved Permanently
- 302 Found
- 303 See Other (since HTTP/1.1)
- 304 Not Modified
- 305 Use Proxy (since HTTP/1.1)
- 306 Switch Proxy
- 307 Temporary Redirect (since HTTP/1.1)
- 308 Permanent Redirect
4xx Client Error
- 400 Bad Request
- 401 Unauthorized
- 402 Payment Required
- 403 Forbidden
- 404 Not Found
- 405 Method Not Allowed
- 406 Not Acceptable
- 407 Proxy Authentication Required
- 408 Request Timeout
- 409 Conflict
- 410 Gone
- 411 Length Required
- 412 Precondition Failed
- 413 Request Entity Too Large
- 414 ~Request-URI Too Long
- 415 Unsupported Media Type
- 416 Requested Range Not Satisfiable
- 417 Expectation Failed
- 418 I'm a teapot (RFC 2324)
- 420 Enhance Your Calm (Twitter)
- 422 Unprocessable Entity (WebDAV; RFC 4918)
- 423 Locked (WebDAV; RFC 4918)
- 424 Failed Dependency (WebDAV; RFC 4918)
- 424 Method Failure (WebDAV)
- 425 Unordered Collection (Internet draft)
- 426 Upgrade Required (RFC 2817)
- 428 Precondition Required (RFC 6585)
- 429 Too Many Requests (RFC 6585)
- 431 Request Header Fields Too Large (RFC 6585)
- 444 No Response (Nginx)
- 449 Retry With (Microsoft)
- 450 Blocked by Windows Parental Controls (Microsoft)
- 451 Unavailable For Legal Reasons (Internet draft)
- 451 Redirect (Microsoft)
- 494 Request Header Too Large (Nginx)
- 495 Cert Error (Nginx)
- 496 No Cert (Nginx)
- 497 HTTP to HTTPS (Nginx)
- 499 Client Closed Request (Nginx)
5xx Server Error
- 500 Internal Server Error
- 501 Not Implemented
- 502 Bad Gateway
- 503 Service Unavailable
- 504 Gateway Timeout
- 505 HTTP Version Not Supported
- 506 Variant Also Negotiates (RFC 2295)
- 507 Insufficient Storage (WebDAV; RFC 4918)
- 508 Loop Detected (WebDAV; RFC 5842)
- 509 Bandwidth Limit Exceeded (Apache bw/limited extension)
- 510 Not Extended (RFC 2774)
- 511 Network Authentication Required (RFC 6585)
- 598 Network read timeout error (MS)
- 599 Network connect timeout error (MS)</pre>