Name resolution APIs and libraries SHOULD recognize localhost names as special and SHOULD always return the IP loopback address for address queries and negative responses for all other query types.

On Unix, MySQL programs treat the host name localhost specially, in a way that is likely different from what you expect compared to other network-based programs. For connections to localhost, MySQL programs attempt to connect to the local server by using a Unix socket file. This occurs even if a --port or -P option is given to specify a port number. To ensure that the client makes a TCP/IP connection to the local server, use --host or -h to specify a host name value of 127.0.0.1, or the IP address or name of the local server. You can also specify the connection protocol explicitly, even for localhost, by using the --protocol=TCP option.

content_security_policy

Firefox does not support:

"http://127.0.0.1" or "http://localhost" as script sources: they must be served over HTTPS.

ベース URL のスキーマ等については特に規定しないが、受信機は、放送及び通信で伝送され

るアプリケーションの両方において、6.1.3.6 に示した形式の URL で参照した場合に、放送

で伝送されるアプリケーションデータへのアクセス(XMLHttpRequest による取得を含む。)

が可能となるベース URL を返す必要がある。また、少なくともアプリケーションが終了する

まではベース URL は不変でなければならない。

- ベース URL の例:"http://localhost:<port_number>/"

During the discovery step, if the sender discovers the endpoint is localhost or a loopback IP address (127.0.0.0/8), it should not send the Webmention to that endpoint.

After you launch Qlik Sense Desktop and log in, you can connect to the Qlik Engine API using the following URI:

ws://localhost:4848/app/

I WANT TO CONNECT FROM A CONTAINER TO A SERVICE ON THE HOST

The Mac has a changing IP address (or none if you have no network access). From 17.06 onwards our recommendation is to connect to the special Mac-only DNS name docker.for.mac.localhost which will resolve to the internal IP address used by the host.

初期状態ではアドレスバーに http://localhost や IP を入力してもローカルホストへのアクセスはできません。

redirect_uri

required string, in query URL to which the user will be redirected after authentication. Must be within the callback domain specified by the application. localhost and 127.0.0.1 are white-listed.