chore: update README.md and refine proxy_filter warning msg

Author: WSH032

.github/pull_request_template.md

@@ -1,5 +1,3 @@
-<!-- copy from: https://github.com/encode/starlette/blob/master/.github/pull_request_template.md -->
-
 <!-- Thanks for contributing 💚
 Given this is a project maintained by volunteers, please read this template to not waste your time, or ours! 😁 -->
 

README.md

@@ -63,7 +63,7 @@ So, it perfectly supports all features of [httpx.AsyncClient](https://www.python
 >     visit our `CHANGELOG.md` for more info.
 
 ```shell
-pip install fastapi-proxy-lib
+pip install fastapi-proxy-lib[standard]
 ```
 
 Perhaps you've noticed that we're installing `fastapi-proxy-lib[standard]` instead of `fastapi-proxy-lib`. The difference is:
@@ -108,6 +108,10 @@ English is not the native language of the author (me), so if you find any areas
 
 If you think this project helpful, consider giving it a star ![GitHub Repo stars](https://img.shields.io/github/stars/wsh032/fastapi-proxy-lib?style=social), which makes me happy. :smile:
 
+## Refers
+
+[Can fastapi proxy another site as a response to the request?](https://github.com/tiangolo/fastapi/discussions/7382)
+
 ## License
 
 This project is licensed under the terms of the *Apache License 2.0*.
@@ -119,7 +123,7 @@ This project is licensed under the terms of the *Apache License 2.0*.
 [CI: lint-test#link]: https://github.com/WSH032/fastapi-proxy-lib/actions/workflows/lint-test.yml
 [CI: docs]: https://github.com/WSH032/fastapi-proxy-lib/actions/workflows/docs.yml/badge.svg?branch=main
 [CI: docs#link]: https://github.com/WSH032/fastapi-proxy-lib/actions/workflows/docs.yml
-[CI: publish]: https://github.com/WSH032/fastapi-proxy-lib/actions/workflows/publish.yml/badge.svg?branch=main
+[CI: publish]: https://github.com/WSH032/fastapi-proxy-lib/actions/workflows/publish.yml/badge.svg
 [CI: publish#link]: https://github.com/WSH032/fastapi-proxy-lib/actions/workflows/publish.yml
 [pre-commit.ci status]: https://results.pre-commit.ci/badge/github/WSH032/fastapi-proxy-lib/main.svg
 [pre-commit.ci status#link]: https://results.pre-commit.ci/latest/github/WSH032/fastapi-proxy-lib/main

src/fastapi_proxy_lib/core/_tool.py

@@ -419,11 +419,13 @@ def warn_for_none_filter(
     if proxy_filter is None:
         msg = dedent(
             """\
-            The proxy filter is None, which means no filter will be used.
-            This is not recommended, because it may cause security issues.
+            The `proxy_filter` is None, which means no filter will be used.
+            It is not recommended, because it may cause security issues.
 
             A default proxy filter will be used, which will reject the proxy request:
              - if the host of url is ip address, and is not global ip address.
+
+            More info: https://wsh032.github.io/fastapi-proxy-lib/Usage/Security/
             """
         )
         warnings.warn(msg, stacklevel=3)