问题描述
当使用 wfastcgi 在 IIS 上部署 python 3.7+ Flask 或 Dash 应用程序时，有很多很棒的教程可以让你好工作程序工作，例如
这个过程对我来说失败了，而对于其他用户来说似乎是
Can't get dash app run on IIS with flask server
How to deploy python flask application in conda base environment on IIS server?
其他软件包开始混入的时候，例如 Numpy、Pandas、Dash、Plotly Express 等。
抛出的错误往往取决于包，但通常类似于一大块测试，看起来像下面以 Error occurred while reading WSGI handler 开头的错误，并具有 Dll 加载失败或缺少组件等内容。
Error occurred while reading WSGI handler: Traceback (most recent call last): File "C:\ProgramData\Anaconda3\envs\dash_search_app\lib\site-packages\wfastcgi.py",line 791,in main env,handler = read_wsgi_handler(response.physical_path) File "C:\ProgramData\Anaconda3\envs\dash_search_app\lib\site-packages\wfastcgi.py",line 633,in read_wsgi_handler handler = get_wsgi_handler(os.getenv("WSGI_HANDLER")) File "C:\ProgramData\Anaconda3\envs\dash_search_app\lib\site-packages\wfastcgi.py",line 616,in get_wsgi_handler raise ValueError('"%s" could not be imported%s' % (handler_name,last_tb)) ValueError: "dashapp.server" could not be imported: Traceback
(most recent call last): File "C:\ProgramData\Anaconda3\envs\dash_search_app\lib\site-packages\wfastcgi.py",line 600,in get_wsgi_handler handler = __import__(module_name,fromlist=[name_list[0][0]]) File ".\dashapp.py",line 3,in from flaskapp import app File ".\flaskapp\__init__.py",line 67,in register_dashapps(app) File ".\flaskapp\__init__.py",line 19,in register_dashapps from flaskapp.dashapp_searchtool.layout import layout File ".\flaskapp\dashapp_searchtool\layout.py",line 30,in import pandas as pd File "C:\ProgramData\Anaconda3\envs\dash_search_app\lib\site-packages\pandas\__init__.py",line 17,in "Unable to import required dependencies:\n" + "\n".join(missing_dependencies)
ImportError: Unable to import required dependencies: numpy: IMPORTANT: PLEASE READ THIS FOR ADVICE ON HOW TO SOLVE THIS ISSUE! Importing the numpy c-extensions failed. -
Try uninstalling and reinstalling numpy. - If you have already done that,then: 1. Check that you expected to use Python3.7 from "C:\ProgramData\Anaconda3\envs\dash_search_app\python.exe",and that you have no directories in your PATH or PYTHONPATH that can interfere with the Python and numpy version "1.17.3" you're trying to use. 2. If (1) looks fine,you can open a new issue at https://github.com/numpy/numpy/issues. Please include details on: - how you installed Python
- how you installed numpy - your operating system - whether or not you have multiple versions of Python installed - if you built from source,your compiler versions and
ideally a build log - If you're working with a numpy git repository,try `git clean -xdf` (removes all files not under version control) and rebuild numpy. Note:
this error has many possible causes,so please don't comment on an existing issue about this - open a new one instead. Original error was: DLL load failed:
The specified module could not be found. StdOut: StdErr: C:\ProgramData\Anaconda3\envs\dash_search_app\lib\site-packages\flask_sqlalchemy\__init__.py:794:
FSADeprecationWarning: SQLALCHEMY_TRACK_MODIFICATIONS adds significant overhead and will be disabled by default in the future. Set it to True or False to suppress this warning.
最常见的建议是降级到 python 3.6，但这并非适用于每个项目。
我已经回答了我的解决方案，以防其他人可能有同样的问题，因为我的谷歌搜索时间没有导致我找到解决方案。
解决方法
对我来说，这归结为权限问题。我的第一个猜测是环境没有正确注册，但实际上是IIS没有权限访问环境的所有依赖项。
我如何解决这个问题是导航到我的 Anaconda3 文件夹，右键单击并选择属性。在属性窗口中，我导航到安全选项卡并单击编辑
然后我点击“添加”以添加用户并显示以下窗口
在对象类型下，我选择了所有选项，位置我选择了顶级位置。
在对象名称下我写了 iis apppool
然后我单击检查名称以确保可以找到该应用程序，然后继续单击确定并应用。
添加权限后，IIS 站点可以访问所有必需的 dll 等，并且应用程序正常运行
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