【问题标题】：Failed to load module script: The server responded with a non-JavaScript MIME type of "text/plain". Strict MIME type checking is enforced for module加载模块脚本失败：服务器以“text/plain”的非 JavaScript MIME 类型响应。对模块执行严格的 MIME 类型检查
【发布时间】：2021-03-07 03:00:41
【问题描述】：

我在安装 django 调试工具栏和 docs 时关注了 this 视频。但是，我就是无法让它工作。在开发工具的控制台选项卡中不断弹出 MIME 类型错误。

settings.py

from pathlib import Path
import os

BASE_DIR = Path(__file__).resolve().parent.parent

SECRET_KEY = 'this is secret'

DEBUG = True

 if DEBUG:
     import mimetypes
     mimetypes.add_type("application/javascript", ".js", True)


INTERNAL_IPS = [
    '127.0.0.1',
]


ALLOWED_HOSTS = [
    'localhost',
    '127.0.0.1',
]


# Application definition

INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'debug_toolbar',
]

MIDDLEWARE = [
    'debug_toolbar.middleware.DebugToolbarMiddleware',
    'django.middleware.security.SecurityMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.common.CommonMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
]

ROOT_URLCONF = 'demo.urls'

TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'DIRS': [os.path.join(BASE_DIR, 'templates')],
        'APP_DIRS': True,
        'OPTIONS': {
            'context_processors': [
                'django.template.context_processors.debug',
                'django.template.context_processors.request',
                'django.contrib.auth.context_processors.auth',
                'django.contrib.messages.context_processors.messages',
            ],
        },
    },
]

WSGI_APPLICATION = 'demo.wsgi.application'


DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.sqlite3',
        'NAME': BASE_DIR / 'db.sqlite3',
    }
}


AUTH_PASSWORD_VALIDATORS = [
    {
        'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.CommonPasswordValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator',
    },
]


LANGUAGE_CODE = 'en-us'

TIME_ZONE = 'UTC'

USE_I18N = True

USE_L10N = True

USE_TZ = True


STATIC_URL = '/static/'
STATICFILES_DIRS = [os.path.join(BASE_DIR, 'static_in_env')]
VENV_PATH = os.path.dirname(BASE_DIR)
STATIC_ROOT = os.path.join(VENV_PATH, 'static_root')
MEDIA_URL = '/media/'
MEDIA_ROOT = os.path.join(VENV_PATH, 'mdeia')


# debug toolbar settings

DEBUG_TOOLBAR_PANELS = [
    'debug_toolbar.panels.versions.VersionsPanel',
    'debug_toolbar.panels.timer.TimerPanel',
    'debug_toolbar.panels.settings.SettingsPanel',
    'debug_toolbar.panels.headers.HeadersPanel',
    'debug_toolbar.panels.request.RequestPanel',
    'debug_toolbar.panels.sql.SQLPanel',
    'debug_toolbar.panels.staticfiles.StaticFilesPanel',
    'debug_toolbar.panels.templates.TemplatesPanel',
    'debug_toolbar.panels.cache.CachePanel',
    'debug_toolbar.panels.signals.SignalsPanel',
    'debug_toolbar.panels.logging.LoggingPanel',
    'debug_toolbar.panels.redirects.RedirectsPanel',
    'debug_toolbar.panels.profiling.ProfilingPanel',
]


def show_toolbar(request):
    return True

DEBUB_TOOLBAR_CONFIG = {
    'SHOW_TOOLBAR_CALLBACK': show_toolbar
}

urls.py

from django.conf import settings
from django.contrib import admin
from django.urls import path, include

from .views import home, java_script




urlpatterns = [
    path('admin/', admin.site.urls),
    path('', home, name='home'),
    path('.*\.js', java_script),
]


if settings.DEBUG:
    import debug_toolbar
    urlpatterns += [path('__debug__/', include(debug_toolbar.urls))]

views.py

from django.shortcuts import render

def home(request):
    return render(request, "index.html", {})



def java_script(request):
    filename = request.path.strip("/")
    data = open(filename, "rb").read()
    return HttpResponse(data, mimetype="application/x-javascript")

base.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta Content-Type: text/html; charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">

    <title>Document</title>
</head>
<body>
    {% block content %}
        
    {% endblock content %}
</body>
</html>

我还在注册表编辑器中将HKEY_CLASSES_ROOT\.js\Content Type设置为text/javascript，如下所示。

here 提出了完全相同的问题，有人要求提供更多信息，但没有提供任何信息，我无法添加 cmets。因此提出了一个全新的问题。

编辑：工具栏出现在 Microsoft Edge 中，WTF！！！

【问题讨论】：

标签： javascript django google-chrome mime-types django-debug-toolbar

【解决方案1】：

不是真正的答案 但仍然

我不知道究竟是什么随机变化让工具栏突然开始工作！但是工具栏现在出现在我真正希望它工作的原始项目中。而且它仍在边缘工作。

上述项目（查看问题）是一个干净的板子，用于测试 django 调试工具栏本身。我想看看它如何/是否在孤立的环境中工作。

我记得所做的唯一更改是：

重新连接蓝牙设备
取消选中在任务栏中显示小图标
在桌面模式下自动隐藏任务栏

原始项目的设置和网址代码如下所示：

settings.py


import os

# Build paths inside the project like this: os.path.join(BASE_DIR, ...)
BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))


# Quick-start development settings - unsuitable for production
# See https://docs.djangoproject.com/en/3.0/howto/deployment/checklist/

# SECURITY WARNING: keep the secret key used in production secret!
SECRET_KEY = Again, this is secret

# SECURITY WARNING: don't run with debug turned on in production!
DEBUG = True


INTERNAL_IPS = [
    'localhost',
    '127.0.0.1',
]


ALLOWED_HOSTS = [
    'localhost',
    '127.0.0.1',
]


# Application definition

INSTALLED_APPS = [
    'auctions',
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'debug_toolbar',
]

MIDDLEWARE = [
    'debug_toolbar.middleware.DebugToolbarMiddleware',
    'django.middleware.security.SecurityMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.common.CommonMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
]

ROOT_URLCONF = 'commerce.urls'

TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'DIRS': [os.path.join(BASE_DIR, 'templates')],
        'APP_DIRS': True,
        'OPTIONS': {
            'context_processors': [
                'django.template.context_processors.debug',
                'django.template.context_processors.request',
                'django.contrib.auth.context_processors.auth',
                'django.contrib.messages.context_processors.messages',
            ],
        },
    },
]

WSGI_APPLICATION = 'commerce.wsgi.application'


# Database
# https://docs.djangoproject.com/en/3.0/ref/settings/#databases

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.sqlite3',
        'NAME': os.path.join(BASE_DIR, 'db.sqlite3'),
    }
}

AUTH_USER_MODEL = 'auctions.User'

# Password validation
# https://docs.djangoproject.com/en/3.0/ref/settings/#auth-password-validators

AUTH_PASSWORD_VALIDATORS = [
    {
        'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.CommonPasswordValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator',
    },
]


# Internationalization
# https://docs.djangoproject.com/en/3.0/topics/i18n/

LANGUAGE_CODE = 'en-us'

TIME_ZONE = 'UTC'

USE_I18N = True

USE_L10N = True

USE_TZ = True


# Static files (CSS, JavaScript, Images)
# https://docs.djangoproject.com/en/3.0/howto/static-files/

STATIC_URL = '/static/'
MEDIA_URL = '/media/'

MEDIA_R00T = os.path.join(BASE_DIR, 'media')


# Default django debug toolbar settings


def show_toolbar(request):
    return True


DEBUG_TOOLBAR_PANELS = [
    'debug_toolbar.panels.versions.VersionsPanel',
    'debug_toolbar.panels.timer.TimerPanel',
    'debug_toolbar.panels.settings.SettingsPanel',
    'debug_toolbar.panels.headers.HeadersPanel',
    'debug_toolbar.panels.request.RequestPanel',
    'debug_toolbar.panels.sql.SQLPanel',
    'debug_toolbar.panels.staticfiles.StaticFilesPanel',
    'debug_toolbar.panels.templates.TemplatesPanel',
    'debug_toolbar.panels.cache.CachePanel',
    'debug_toolbar.panels.signals.SignalsPanel',
    'debug_toolbar.panels.logging.LoggingPanel',
    'debug_toolbar.panels.redirects.RedirectsPanel',
    'debug_toolbar.panels.profiling.ProfilingPanel',
]


DEBUG_TOOLBAR_CONFIG = {
    'SHOW_TOOLBAR_CALLBACK': show_toolbar
}

项目级 urls.py


from django.conf import settings
from django.contrib import admin
from django.urls import include, path
from django.conf.urls.static import static
import debug_toolbar

urlpatterns = [
    path("admin/", admin.site.urls),
    path("", include("auctions.urls")),
    path('__debug__/', include(debug_toolbar.urls)),
] + static(settings.MEDIA_URL, document_root=settings.MEDIA_ROOT)

应用级 urls.py

from django.urls import path

from . import views


app_name = "auctions"
urlpatterns = [
    path("", views.index, name="index"),
    path("login", views.login_view, name="login"),
    path("logout", views.logout_view, name="logout"),
    path("register", views.register, name="register"),
    path("create_listing", views.create_listing, name="create_listing"),
    path("listing/<str:listing>", views.listing_detail, name="detail_view")
]

测试项目

原始项目

更新

我对原项目做了一些改动（想对模型进行改动）：

删除了 sqlite .db 文件
还删除了迁移文件夹

不幸的是，这些操作影响了 django 调试工具栏，使其消失了。为了恢复工具栏，我做了git reset --hard <ref name> 其中 ref name 是工具栏所在的上一个提交。但是，这不起作用。

django 调试工具栏也从我创建的测试项目中消失了，即使我没有对该项目的代码或目录结构进行任何更改。

【讨论】：

【解决方案2】：

参考下面的代码解决了这个问题。

from django.http import JsonResponse
def java_script(request):
    filename = request.path.strip("/")
    data = open(filename, "rb").read()
    # return HttpResponse(data, mimetype="application/x-javascript")
    return JsonResponse(data, safe=False)
    #enter code here

【讨论】：

输出没有变化。我仍然可以在边缘看到工具栏，但它在 chrome 中顽固地不存在。同样，该控制台错误仍然存在于 chrome 中。