是否可以为Starlette / Uvicorn显式设置MIME类型？

Question

看来，我的简单Starlette / Uvicorn Web应用程序正在为Jinja模板化（从同一服务器提供）JavaScript文件提供不正确的MIME内容类型。从屏幕截图中可以看到，uvicorn服务器正在将* .js文件转换为类型（“文本/纯文本”）。

Screenshot

我已经搜寻了Starlette和Uvicorn的文档，简直陷入了困境。

我的简单网络应用程序如下：

from starlette.applications import Starlette
from starlette.staticfiles import StaticFiles
from starlette.responses import HTMLResponse
from starlette.templating import Jinja2Templates
from starlette.middleware.cors import CORSMiddleware
import uvicorn
from random import randint

port = randint(49152,65535)

templates = Jinja2Templates(directory='templates')


app = Starlette(debug=True)
app.mount('/static', StaticFiles(directory='statics', html=True), name='static')
app.add_middleware(
    CORSMiddleware, allow_origins=["*"], allow_headers=["*"], allow_methods=["*"]
)

@app.route('/')
async def homepage(request):
    template = "index.html"
    context = {"request": request}
    return templates.TemplateResponse(template, context, media_type='text/html')


@app.route('/error')
async def error(request):
    """
    An example error. Switch the `debug` setting to see either tracebacks or 500 pages.
    """
    raise RuntimeError("Oh no")


@app.exception_handler(404)
async def not_found(request, exc):
    """
    Return an HTTP 404 page.
    """
    template = "404.html"
    context = {"request": request}
    return templates.TemplateResponse(template, context, status_code=404)


@app.exception_handler(500)
async def server_error(request, exc):
    """
    Return an HTTP 500 page.
    """
    template = "500.html"
    context = {"request": request}
    return templates.TemplateResponse(template, context, status_code=500)


if __name__ == "__main__":
    uvicorn.run("app-567:app", host='0.0.0.0', port=port, log_level="info", http='h11', loop='asyncio', reload=True)

加载到头部的JavaScript文件给出了相同的错误，但是仍然加载。这是Firefox（73.0 64位）中新的“ nosniff”默认设置的副产品。作为模块导入加载的脚本将完全失败。

我正在运行Windows 10（x64），Python 3.7，uvicorn 0.11.2和starlette 0.13.1。

非常感谢您的帮助。预先谢谢你。

Answer 1

我能够通过如下显式设置mimetypes变量来解决此问题：

from starlette.applications import Starlette
from starlette.staticfiles import StaticFiles
from starlette.responses import HTMLResponse
from starlette.templating import Jinja2Templates
from starlette.middleware.cors import CORSMiddleware
import uvicorn
from random import randint

import mimetypes
mimetypes.init()

port = randint(49152,65535)

templates = Jinja2Templates(directory='templates')


app = Starlette(debug=True)
app.mount('/static', StaticFiles(directory='statics', html=True), name='static')
app.add_middleware(
    CORSMiddleware, allow_origins=["*"], allow_headers=["*"], allow_methods=["*"]
)

@app.route('/')
async def homepage(request):
    mimetypes.add_type('application/javascript', '.js')
    mimetypes.add_type('text/css', '.css')
    mimetypes.add_type('image/svg+xml', '.svg')
    template = "index.html"
    context = {"request": request}
    return templates.TemplateResponse(template, context, media_type='text/html')


@app.route('/error')
async def error(request):
    """
    An example error. Switch the `debug` setting to see either tracebacks or 500 pages.
    """
    raise RuntimeError("Oh no")


@app.exception_handler(404)
async def not_found(request, exc):
    """
    Return an HTTP 404 page.
    """
    template = "404.html"
    context = {"request": request}
    return templates.TemplateResponse(template, context, status_code=404)


@app.exception_handler(500)
async def server_error(request, exc):
    """
    Return an HTTP 500 page.
    """
    template = "500.html"
    context = {"request": request}
    return templates.TemplateResponse(template, context, status_code=500)


if __name__ == "__main__":
    uvicorn.run("app-567:app", host='0.0.0.0', port=port, log_level="info", http='h11', loop='asyncio', reload=True)