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  1. Undertow
  2. UNDERTOW-1472

Content-Type header is not set in HTTP response for directory resource in servlet directory-listing feature

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    • Icon: Bug Bug
    • Resolution: Done
    • Icon: Major Major
    • 2.0.17.Final
    • 2.0.15.Final
    • Servlet
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      1. unzip wildfly and start: ./bin/standalone.sh
      2. connect to CLI: ./bin/jboss-cli.sh -c
      3. deploy attached simple war app with example directory - [^helloworld-html5.war]
      4. enable directory-listing: 
        /subsystem=undertow/servlet-container=default:write-attribute(name=directory-listing,value=true)
reload
      5. perform request via browser to http://localhost:8080/helloworld-html5/css - page is rendered correctly with js and css styles downloaded properly
      6. configure X-Content-Type-Options header and enable directory-listing 
        /subsystem=undertow/configuration=filter/response-header=x-content:add(header-name=X-Content-Type-Options,header-value=nosniff)
/subsystem=undertow/server=default-server/host=default-host/filter-ref=x-content:add()
      7. perform same request again and see that js and css styles have not been downloaded due to the css directory resource has been rendered as a raw text instead of html code.
      Show
      unzip wildfly and start: ./bin/standalone.sh connect to CLI: ./bin/jboss-cli.sh -c deploy attached simple war app with example directory - [^helloworld-html5.war] enable directory-listing: /subsystem=undertow/servlet-container= default :write-attribute(name=directory-listing,value= true ) reload perform request via browser to http://localhost:8080/helloworld-html5/css - page is rendered correctly with js and css styles downloaded properly configure X-Content-Type-Options header and enable directory-listing /subsystem=undertow/configuration=filter/response-header=x-content:add(header-name=X-Content-Type-Options,header-value=nosniff) /subsystem=undertow/server= default -server/host= default -host/filter-ref=x-content:add() perform same request again and see that js and css styles have not been downloaded due to the css directory resource has been rendered as a raw text instead of html code.

      DefaultServlet does not set Content-Type HTTP header in response for the directory resource when directory-listing feature is enabled.

      As browsers apparently try to guess appropriate Content-Type of the downloaded resource, this problem is not spotted unless in combination with X-Content-Type-Options header is present in the HTTP response too. This header effectively discourages browser to guess the Content-Type of the resource.

      Output for directory-listing request in attached reproducer [^helloworld-html5.war]:

      $ curl -v http://127.0.0.1:8080/helloworld-html5/css/  >/dev/null 
*   Trying 127.0.0.1...
* TCP_NODELAY set
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0* Connected to 127.0.0.1 (127.0.0.1) port 8080 (#0)
> GET /helloworld-html5/css/ HTTP/1.1
> Host: 127.0.0.1:8080
> User-Agent: curl/7.59.0
> Accept: */*
> 
< HTTP/1.1 200 OK
< Connection: keep-alive
< Content-Length: 824
< Date: Fri, 04 Jan 2019 14:32:46 GMT
< 
{ [824 bytes data]
100   824  100   824    0     0   804k      0 --:--:-- --:--:-- --:--:--  804k
* Connection #0 to host 127.0.0.1 left intact

      Notice that there is no Content-Type header in HTTP response.

              sdouglas1@redhat.com Stuart Douglas (Inactive)
              jstourac@redhat.com Jan Stourac
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                Created:
                Updated:
                Resolved: