Flask和Apache-日志中没有错误，始终为404

问题描述 投票：0回答：1

我正在尝试使用mod_wsgi使Flask与Apache一起工作，而我已经为此花了七个多小时来猛烈抨击。是时候寻求帮助了。

我正在使用httpd泊坞映像运行Apache。

我首先按照here的说明启动了wsgi'hello world'应用程序，并且运行良好。如果打开浏览器并导航至172.17.0.2，我会看到位于/usr/local/apache2/htdocs/]上的页面

在我的httpd.conf中，我显示了以下页面：

DocumentRoot "/usr/local/apache2/htdocs"
<Directory "/usr/local/apache2/htdocs">
    #
    # Possible values for the Options directive are "None", "All",
    # or any combination of:
    #   Indexes Includes FollowSymLinks SymLinksifOwnerMatch ExecCGI MultiView
    #
    # Note that "MultiViews" must be named *explicitly* --- "Options All"
    # doesn't give it to you.
    #
    # The Options directive is both complicated and important.  Please see
    # http://httpd.apache.org/docs/2.4/mod/core.html#options
    # for more information.
    #
    Options Indexes FollowSymLinks

    #
    # AllowOverride controls what directives may be placed in .htaccess files.
    # It can be "All", "None", or any combination of the keywords:
    #   AllowOverride FileInfo AuthConfig Limit
    #
    AllowOverride None

    #
    # Controls who can get stuff from this server.
    #
    Require all granted
</Directory>

这是Docker映像中的所有默认设置。

然后，在/usr/local/apache2/wsgi-scripts/myapp.wsgi，我在mod_wsgi指令页面上有一个hello world示例。在我的httpd.conf中，我有以下内容

WSGIScriptAlias /myapp /usr/local/apache2/wsgi-scripts/myapp.wsgi

<Directory /usr/local/apache2/wsgi-scripts>
  <IfVersion < 2.4>
      Order allow,deny
      Allow from all
  </IfVersion>
  <IfVersion >= 2.4>
      Require all granted
  </IfVersion>
</Directory>

[当我使用浏览器导航至172.17.0.2/myapp时，一切都很好。我看到“ hello world”，并且apache打印以下日志：
[Thu Apr 16 02:48:14.678027 2020] [wsgi:info] [pid 1275:tid 140646030583552] mod_wsgi (pid=1275): Create interpreter '172.17.0.2|/myapp'.
[Thu Apr 16 02:48:14.713667 2020] [wsgi:info] [pid 1275:tid 140646030583552] [client 172.17.0.1:38046] mod_wsgi (pid=1275, process='', application='172.17.0.2|/myapp'): Loading Python script file '/usr/local/apache2/wsgi-scripts/myapp.wsgi'.
172.17.0.1 - - [16/Apr/2020:02:48:14 +0000] "GET /myapp HTTP/1.1" 200 12

现在，我尝试使我的烧瓶应用程序正常工作。这是出问题的地方。我的wsgi脚本位于上方myapp.wsgi脚本的旁边：
root@423828dd037e:/# ls -l /usr/local/apache2/wsgi-scripts/
total 8
-rw-r--r-- 1 root root 278 Apr 16 02:16 myapp.wsgi
-rw-r--r-- 1 root root  74 Apr 16 02:22 website_api.wsgi

脚本非常简单：
root@423828dd037e:/# cat /usr/local/apache2/wsgi-scripts/website_api.wsgi
from website_rest_api import app as application

我可以在python解释器中运行完全相同的命令，所以我知道导入工作正常。

我有

WSGIScriptAlias /api /usr/local/apache2/wsgi-scripts/website_api.wsgi

在我的httpd.conf文件中]
[当我尝试导航至172.17.0.2/api时，我完全感到沮丧。 apache日志如下所示：
[Thu Apr 16 02:52:41.678999 2020] [wsgi:info] [pid 1395:tid 140174394627840] mod_wsgi (pid=1395): Create interpreter '172.17.0.2|/api'.
[Thu Apr 16 02:52:41.683555 2020] [wsgi:info] [pid 1477:tid 140174539728000] mod_wsgi (pid=1477): Python home /usr.
[Thu Apr 16 02:52:41.683649 2020] [wsgi:info] [pid 1477:tid 140174539728000] mod_wsgi (pid=1477): Initializing Python.
[Thu Apr 16 02:52:41.710027 2020] [wsgi:info] [pid 1477:tid 140174539728000] mod_wsgi (pid=1477): Attach interpreter ''.
[Thu Apr 16 02:52:41.714671 2020] [wsgi:info] [pid 1395:tid 140174394627840] [client 172.17.0.1:40228] mod_wsgi (pid=1395, process='', application='172.17.0.2|/api'): Loading Python script file '
/usr/local/apache2/wsgi-scripts/website_api.wsgi'.
[Thu Apr 16 02:52:41.736762 2020] [wsgi:info] [pid 1477:tid 140174539728000] mod_wsgi (pid=1477): Imported 'mod_wsgi'.
172.17.0.1 - - [16/Apr/2020:02:52:41 +0000] "GET /api HTTP/1.1" 404 232

从这些日志中，我知道apache知道这是mod_wsgi的事情。似乎它从正确的位置加载了脚本，但是随后我得到了404。我对所有烧瓶的URL都得到了它。我应该能够打/ api，/ api / login，/ api / logout，/ api / projects，/ api / tests，但是什么也没有。一切都是404，我看不到其他错误可以帮助调试。
我知道from website_rest_api import app as application会导入正确的内容，因为我可以进入python shell并亲自查看URL映射：
>>> from website_rest_api import app as application
>>> application.url_map
Map([<Rule '/api/projects' (OPTIONS, HEAD, GET) -> projects>,
 <Rule '/api/logout' (POST, OPTIONS) -> logout>,
 <Rule '/api/login' (POST, OPTIONS) -> login>,
 <Rule '/api/tests' (OPTIONS, HEAD, GET) -> tests>,
 <Rule '/api' (OPTIONS, HEAD, GET) -> hello>,
 <Rule '/static/<filename>' (OPTIONS, HEAD, GET) -> static>])

我也可以打印这些内容，以便它们显示在apache日志中：
[Thu Apr 16 04:38:57.162667 2020] [wsgi:info] [pid 2953:tid 139925743146112] mod_wsgi (pid=2953): Imported 'mod_wsgi'.
[Thu Apr 16 04:38:57.396592 2020] [wsgi:error] [pid 2864:tid 139925713024768] Map([<Rule '/api/projects' (GET, OPTIONS, HEAD) -> projects>,
[Thu Apr 16 04:38:57.396634 2020] [wsgi:error] [pid 2864:tid 139925713024768]  <Rule '/api/logout' (OPTIONS, POST) -> logout>,
[Thu Apr 16 04:38:57.396642 2020] [wsgi:error] [pid 2864:tid 139925713024768]  <Rule '/api/login' (OPTIONS, POST) -> login>,
[Thu Apr 16 04:38:57.396649 2020] [wsgi:error] [pid 2864:tid 139925713024768]  <Rule '/api/tests' (GET, OPTIONS, HEAD) -> tests>,
[Thu Apr 16 04:38:57.396657 2020] [wsgi:error] [pid 2864:tid 139925713024768]  <Rule '/api' (GET, OPTIONS, HEAD) -> hello>,
[Thu Apr 16 04:38:57.396666 2020] [wsgi:error] [pid 2864:tid 139925713024768]  <Rule '/static/<filename>' (GET, OPTIONS, HEAD) -> static>])

[我也可以故意将website_api.wsgi中的导入弄乱，并且我看到Apache吐出了一条错误消息，所以我有理由相信，如果导入错误，它将告诉我：
[Thu Apr 16 04:34:27.634313 2020] [wsgi:info] [pid 2743:tid 139796746721024] [remote 172.17.0.1:60664] mod_wsgi (pid=2743, process='website_api', application=''): Loading Python script file '/usr
/local/apache2/wsgi-scripts/website_api.wsgi'.
[Thu Apr 16 04:34:27.634956 2020] [wsgi:error] [pid 2743:tid 139796746721024] [remote 172.17.0.1:60664] mod_wsgi (pid=2743): Failed to exec Python script file '/usr/local/apache2/wsgi-scripts/web
site_api.wsgi'.
[Thu Apr 16 04:34:27.635044 2020] [wsgi:error] [pid 2743:tid 139796746721024] [remote 172.17.0.1:60664] mod_wsgi (pid=2743): Exception occurred processing WSGI script '/usr/local/apache2/wsgi-scr
ipts/website_api.wsgi'.
[Thu Apr 16 04:34:27.644848 2020] [wsgi:error] [pid 2743:tid 139796746721024] [remote 172.17.0.1:60664] Traceback (most recent call last):
[Thu Apr 16 04:34:27.644905 2020] [wsgi:error] [pid 2743:tid 139796746721024] [remote 172.17.0.1:60664]   File "/usr/local/apache2/wsgi-scripts/website_api.wsgi", line 1, in <module>
[Thu Apr 16 04:34:27.644917 2020] [wsgi:error] [pid 2743:tid 139796746721024] [remote 172.17.0.1:60664]     import zarzlefrz
[Thu Apr 16 04:34:27.644943 2020] [wsgi:error] [pid 2743:tid 139796746721024] [remote 172.17.0.1:60664] ModuleNotFoundError: No module named 'zarzlefrz'
172.17.0.1 - - [16/Apr/2020:04:34:27 +0000] "GET /api HTTP/1.1" 500 528

即使调试级别的日志似乎也没有告诉我发生了什么事：
[Thu Apr 16 03:53:52.766115 2020] [core:debug] [pid 2075:tid 140389386400896] log.c(1571): AH02639: Using SO_REUSEPORT: yes (1)
[Thu Apr 16 03:53:52.766422 2020] [wsgi:info] [pid 2079:tid 140389386400896] mod_wsgi (pid=2079): Python home /usr.
[Thu Apr 16 03:53:52.766546 2020] [wsgi:info] [pid 2079:tid 140389386400896] mod_wsgi (pid=2079): Initializing Python.
[Thu Apr 16 03:53:52.769139 2020] [wsgi:info] [pid 2078:tid 140389386400896] mod_wsgi (pid=2078): Python home /usr.
[Thu Apr 16 03:53:52.769300 2020] [wsgi:info] [pid 2078:tid 140389386400896] mod_wsgi (pid=2078): Initializing Python.
[Thu Apr 16 03:53:52.805797 2020] [wsgi:info] [pid 2077:tid 140389386400896] mod_wsgi (pid=2077): Attach interpreter ''.
[Thu Apr 16 03:53:52.806676 2020] [wsgi:info] [pid 2079:tid 140389386400896] mod_wsgi (pid=2079): Attach interpreter ''.
[Thu Apr 16 03:53:52.813314 2020] [wsgi:info] [pid 2078:tid 140389386400896] mod_wsgi (pid=2078): Attach interpreter ''.
[Thu Apr 16 03:53:52.845456 2020] [wsgi:info] [pid 2079:tid 140389386400896] mod_wsgi (pid=2079): Imported 'mod_wsgi'.
[Thu Apr 16 03:53:52.847250 2020] [mpm_event:debug] [pid 2079:tid 140389373064960] event.c(2314): AH02471: start_threads: Using epoll (wakeable)
[Thu Apr 16 03:53:52.859225 2020] [wsgi:info] [pid 2077:tid 140389386400896] mod_wsgi (pid=2077): Imported 'mod_wsgi'.
[Thu Apr 16 03:53:52.860438 2020] [mpm_event:debug] [pid 2077:tid 140389373064960] event.c(2314): AH02471: start_threads: Using epoll (wakeable)
[Thu Apr 16 03:53:52.862762 2020] [wsgi:info] [pid 2078:tid 140389386400896] mod_wsgi (pid=2078): Imported 'mod_wsgi'.
[Thu Apr 16 03:53:52.863600 2020] [mpm_event:debug] [pid 2078:tid 140389373064960] event.c(2314): AH02471: start_threads: Using epoll (wakeable)
[Thu Apr 16 03:54:03.057717 2020] [authz_core:debug] [pid 2079:tid 140389235279616] mod_authz_core.c(818): [client 172.17.0.1:41350] AH01626: authorization result of Require all granted: granted
[Thu Apr 16 03:54:03.057771 2020] [authz_core:debug] [pid 2079:tid 140389235279616] mod_authz_core.c(818): [client 172.17.0.1:41350] AH01626: authorization result of <RequireAny>: granted
[Thu Apr 16 03:54:03.086984 2020] [wsgi:info] [pid 2079:tid 140389235279616] mod_wsgi (pid=2079): Create interpreter '172.17.0.2|/api'.
[Thu Apr 16 03:54:03.128584 2020] [wsgi:info] [pid 2079:tid 140389235279616] [client 172.17.0.1:41350] mod_wsgi (pid=2079, process='', application='172.17.0.2|/api'): Loading Python script file '
/usr/local/apache2/wsgi-scripts/website_api.wsgi'.
172.17.0.1 - - [16/Apr/2020:03:54:03 +0000] "GET /api HTTP/1.1" 404 232

我的问题：
我该怎么进一步调试呢？有什么地方喷出我看不见的暗瓶错误吗？

我正在尝试使用mod_wsgi使Flask与Apache一起工作，而我已经为此花了七个多小时来猛烈抨击。现在该寻求帮助了。我正在使用httpd docker运行apache ...

apache flask mod-wsgi
1个回答
0
投票

好吧，我已经弄清楚了-秘密的调试技巧是走一个小时然后再回来。我希望我在六个小时前尝试过。

烧瓶应用程序具有这样的路由：

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