Added requirements doco.

index.htm

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+Unless otherwise specified, all return:
+
+    HTTP/1.1 {status code} {status description}
+    Content-Type: text/plain
+    Content-Length: {something}
+    {any custom response headers}
+
+    {status code} {status description}
+    {list of any custom response headers we added}
+
+For example:
+
+    HTTP/1.1 307 Temporary Redirect
+    Content-Type: text/plain
+    Content-Length: 153
+    Location: http://httpstat.us
+
+    307 Temporary Redirect
+    Location: http://httpstat.us
+
+Here are all the codes we support (and any special responses):
+
+100 Continue
+101 Switching Protocols
+    Upgrade: HTTP/1.1
+    Connection: Upgrade
+200 OK
+201 Created
+202 Accepted
+203 Non-Authoritative Information
+204 No Content
+    Doesn't return a body, Content-Type or Content-Length header
+205 Reset Content
+    Doesn't return a body, Content-Type or Content-Length header
+206 Partial Content
+    Content-Range: 0-30
+300 Multiple Choices
+301 Moved Permanently
+    Location: http://httpstat.us
+302 Found
+    Location: http://httpstat.us
+303 See Other
+    Location: http://httpstat.us
+304 Not Modified
+    Doesn't return a body, Content-Type or Content-Length header
+305 Use Proxy
+    Location: http://httpstat.us
+306 Unused
+307 Temporary Redirect
+    Location: http://httpstat.us
+400 Bad Request
+401 Unauthorized
+    WWW-Authenticate: Basic realm="Fake Realm"
+402 Payment Required
+403 Forbidden
+404 Not Found
+405 Method Not Allowed
+406 Not Acceptable
+407 Proxy Authentication Required
+    Proxy-Authenticate: Basic realm="Fake Realm"
+408 Request Timeout
+409 Conflict
+410 Gone
+411 Length Required
+412 Precondition Required
+413 Request Entity Too Large
+414 Request-URI Too Long
+415 Unsupported Media Type
+416 Requested Range Not Satisfiable
+417 Expectation Failed
+500 Internal Server Error
+501 Not Implemented
+502 Bad Gateway
+503 Service Unavailable
+504 Gateway Timeout
+505 HTTP Version Not Supported
+
+If you send any other three digit number that's not in that list, we'll return it too.
+
+    HTTP/1.1 652 Unknown Status
+    Content-Type: text/plain
+    Content-Length: 153
+
+    652 Unknown Status