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最近在详细研究FastAPI，其中设计加载静态文件，但是今天加载的过程中不想按照官网的样式规规矩矩的，想着可以不可以自定义路径，显示伪静态什么的，然后就各种尝试，但是始终报错，弄的一脸懵逼。不过最终这个问题还是解决了，关于这个问题我放在文章最后了。

下面开始讲解

app.mount('/aaaaa', StaticFiles(directory='bbbbbbb'), name='static')

详解app.mout()函数的几个参数：

第一个“/aaaaa”和网址有关，如“http://127.0.0.1/aaaaa/”再加文件子路径。

第二个 StaticFiles(directory="bbbbbbb")，指的是你真实的静态文件存放的目录，是相对路径，可以有多级子路径

第三个 name="static"，python3.9 这个不可以省略，这各主要是模板中调用，如下面的代码，url_for括号内的第一个static就是这里的名字。后面的路径加上第二个参数的路径就是文件的完整相对路径。

<link href="{{%20url_for('static',%20path='/css/bootstrap.min.css')%20}}" rel="stylesheet">

这里再说一些，学习这个问题的过程中爆出的异常问题。

最后换成官网的页报错，报错如下：

ERROR:    Exception in ASGI application
Traceback (most recent call last):
  File "F:\hk\python\tools\Python39\lib\site-packages\uvicorn\protocols\http\h11_impl.py", line 369, in run_asgi
    result = await app(self.scope, self.receive, self.send)
  File "F:\hk\python\tools\Python39\lib\site-packages\uvicorn\middleware\proxy_headers.py", line 59, in __call__
    return await self.app(scope, receive, send)
  File "F:\hk\python\tools\Python39\lib\site-packages\fastapi\applications.py", line 199, in __call__
    await super().__call__(scope, receive, send)
  File "F:\hk\python\tools\Python39\lib\site-packages\starlette\applications.py", line 112, in __call__
    await self.middleware_stack(scope, receive, send)
  File "F:\hk\python\tools\Python39\lib\site-packages\starlette\middleware\errors.py", line 181, in __call__
    raise exc from None
  File "F:\hk\python\tools\Python39\lib\site-packages\starlette\middleware\errors.py", line 159, in __call__
    await self.app(scope, receive, _send)
  File "F:\hk\python\tools\Python39\lib\site-packages\starlette\exceptions.py", line 82, in __call__
    raise exc from None
  File "F:\hk\python\tools\Python39\lib\site-packages\starlette\exceptions.py", line 71, in __call__
    await self.app(scope, receive, sender)
  File "F:\hk\python\tools\Python39\lib\site-packages\starlette\routing.py", line 580, in __call__
    await route.handle(scope, receive, send)
  File "F:\hk\python\tools\Python39\lib\site-packages\starlette\routing.py", line 241, in handle
    await self.app(scope, receive, send)
  File "F:\hk\python\tools\Python39\lib\site-packages\starlette\routing.py", line 52, in app
    response = await func(request)
  File "F:\hk\python\tools\Python39\lib\site-packages\fastapi\routing.py", line 216, in app
    raw_response = await run_endpoint_function(
  File "F:\hk\python\tools\Python39\lib\site-packages\fastapi\routing.py", line 149, in run_endpoint_function
    return await dependant.call(**values)
  File "F:\hk\python\fastapi_xuexi\FastAPI_6_bootstrap\main.py", line 30, in main
    return templates.TemplateResponse('login.html', {'request': Request})
  File "F:\hk\python\tools\Python39\lib\site-packages\starlette\templating.py", line 81, in TemplateResponse
    return _TemplateResponse(
  File "F:\hk\python\tools\Python39\lib\site-packages\starlette\templating.py", line 27, in __init__
    content = template.render(context)
  File "F:\hk\python\tools\Python39\lib\site-packages\jinja2\environment.py", line 1304, in render
    self.environment.handle_exception()
  File "F:\hk\python\tools\Python39\lib\site-packages\jinja2\environment.py", line 925, in handle_exception
    raise rewrite_traceback_stack(source=source)
  File "templates\login.html", line 10, in top-level template code
    <link rel="icon" href="{{%20url_for('static',%20path='/imgs/favicon.ico')%20}}">
  File "F:\hk\python\tools\Python39\lib\site-packages\starlette\templating.py", line 59, in url_for
    return request.url_for(name, **path_params)
TypeError: url_for() missing 1 required positional argument: 'name'

就这个原因，排查了好久，怎么都没搞懂，始终以为是我模板有问题，最后发现不是，是我Python代码有问题，代码如下：

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@app.get("/")
async def main(request: Request):
    return templates.TemplateResponse('login.html', {'request': <span style="color: #ff0000;">Request</span>})
                                                   ##正确应该小写request
 
if __name__ == "__main__":
    import uvicorn
 
    uvicorn.run(app, host='127.0.0.1', port=80)

没错，问题就出在Request，正确应该小写。

文章参考：

https://fastapi.tiangolo.com/zh/tutorial/static-files/

https://www.starlette.io/staticfiles/