Web Apps

Web Apps in Azure App Service provides a scalable, reliable, and easy-to-use environment for hosting web applications. Select from a range of frameworks and templates to create a web site in seconds. Use any tool or OS to develop your site with .NET, PHP, Node.js, Python and more. Choose from a variety of source control options including TFS, GitHub, BitBucket and others to set up continuous integration and develop as a team.

More details about the services are available in the App Service documentation. If you have a technical issue, please open a post on the developer forums through Stack Overflow or MSDN.

Products that we listen to in this space include: App Service, Web Apps, API Apps and Web App for Containers.

We welcome user feedback and feature requests!

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  1. If there is a .NET core startup issue, it would be good if Azure automagically turned on stdout logging

    It's not intuitive to enable stdout logging on .NET core, especially knowing where it's going to put the log output.

    Azure seems to already be capable of detecting a .NET core startup error, if would be good if it automatically changed the web.config for stdout logging and showed some error output on the 'Diagnose and solve problems' screen.

    1 vote
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      0 comments  ·  Deployment  ·  Flag idea as inappropriate…  ·  Admin →
    • App services should show the max supported version of ASP.NET core

      If you deploy an app with a version of .NET Core that isn't deployed on Azure yet, you get horrible to debug errors that you have to enable stdout logging on to get to the bottom of.

      (Ultimatly editing csproj with PublishWithAspNetCoreTargetManifest set to false)

      Confusing and time consuming. It would be great if Azure showed you some where on the app, a max supported version of .NET core and some kind of publishing warning if you try to push something higher.

      1 vote
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        0 comments  ·  Deployment  ·  Flag idea as inappropriate…  ·  Admin →
      • Remove Weak SSL Cyphers from App Services

        App Services currently supports the following Cyphers:

        HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Cryptography\Configuration\Local\SSL\00010002
        (Default) REG_SZ NCRYPT_SCHANNEL_INTERFACE
        Functions REG_MULTI_SZ
        TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P256\
        0TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P384\
        0TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256\
        0TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P384\
        0TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA_P256\
        0TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA_P384\
        0TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA_P256\
        0TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA_P384
        \0TLS_DHE_RSA_WITH_AES_256_GCM_SHA384\
        0TLS_DHE_RSA_WITH_AES_128_GCM_SHA256\
        0TLS_RSA_WITH_AES_256_GCM_SHA384\
        0TLS_RSA_WITH_AES_128_GCM_SHA256\
        0TLS_RSA_WITH_AES_256_CBC_SHA256\
        0TLS_RSA_WITH_AES_128_CBC_SHA256\
        0TLS_RSA_WITH_AES_256_CBC_SHA\
        0TLS_RSA_WITH_AES_128_CBC_SHA\
        0TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384_P384\
        0TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256_P256\
        0TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256_P384\
        0TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384_P384\
        0TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256_P256\
        0TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256_P384\
        0TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA_P256\
        0TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA_P384\
        0TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA_P256\
        0TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA_P384\
        0TLS_DHE_DSS_WITH_AES_256_CBC_SHA256\
        0TLS_DHE_DSS_WITH_AES_128_CBC_SHA256\
        0TLS_DHE_DSS_WITH_AES_256_CBC_SHA\
        0TLS_DHE_DSS_WITH_AES_128_CBC_SHA\
        0TLS_RSA_WITH_3DES_EDE_CBC_SHA\
        0TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA\
        0TLS_RSA_WITH_RC4_128_SHA\
        0TLS_RSA_WITH_RC4_128_MD5\
        0TLS_RSA_WITH_NULL_SHA256\
        0TLS_RSA_WITH_NULL_SHA\
        0SSL_CK_RC4_128_WITH_MD5\
        0SSL_CK_DES_192_EDE3_CBC_WITH_MD5

        All Old/Weak Cyphers should be removed to increase security of the service.

        3 votes
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          0 comments  ·  Flag idea as inappropriate…  ·  Admin →
        • [LINUX] Provide node.js 8.9 LTS as an available runtime

          Node 8.9 is now the LTS version and 6.x is in maintenance. Please add Node 8.9 to the list of available runtime stacks for App Service Docker containers.

          16 votes
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            1 comment  ·  Flag idea as inappropriate…  ·  Admin →
          • app service authentication - support convergence login for MicrosoftAccount defined at apps.dev.microsoft.com

            Allow app service to support authentication from microsoft accounts apps configured with convergence...

            3 votes
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              0 comments  ·  Flag idea as inappropriate…  ·  Admin →
            • Allow Azure App Service IP Restriction configuration by PowerShell Script

              At the moment an Azure App service has the ability to white list IP addresses through the Networking > IP Restriction blade. It would be useful if this could be configured through PowerShell.

              11 votes
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                0 comments  ·  Flag idea as inappropriate…  ·  Admin →
              • Document healthcheck URL requirement for custom containers

                With Web App for Containers, it seems Azure uses a special URL "/robots933456.txt" to check when the container has started, and expects a valid HTTP response (404 is fine). This requirement for custom containers should be mentioned in the documentation! (and preferably, it should be configurable)

                4 votes
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                  under review  ·  0 comments  ·  Flag idea as inappropriate…  ·  Admin →
                • Improve Python offerings and eliminate reoccurring issues on Python

                  The Python offerings has so many issues and I feel it is the most neglected Language on Azure. I have encountered really silly issues on Python extensions which can increase the development time on such apps thus decreasing productivity. Please improve on the same as this is one of the most important languages and Azure limits the way it can be used which can cause many potential people moving away from Azure due to its limitations.

                  1 vote
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                    under review  ·  0 comments  ·  Flag idea as inappropriate…  ·  Admin →
                  • Azure Web App auth customize WWW-Authenticate challenge

                    Support authorization_uri in Azure AD Pre-Auth for Web Apps

                    https://stackoverflow.com/questions/46908858/azure-web-app-auth-customize-www-authenticate-challenge

                    According to some docs (https://docs.microsoft.com/en-us/azure/active-directory/develop/active-directory-protocols-oauth-code#use-the-access-token-to-access-the-resource), the WWW-authenticate header should return authorization_uri like this:

                    HTTP/1.1 401 Unauthorized
                    WWW-Authenticate: Bearer authorization_uri="https://login.microsoftonline.com/contoso.com/oauth2/authorize", error="invalid_token", error_description="The access token is missing.",

                    But since we use the pre-authentication features of Azure Web Apps, we can't control that directly from code.

                    18 votes
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                      0 comments  ·  Flag idea as inappropriate…  ·  Admin →
                    • WebApp custom DNS with private DNS Name

                      Custom DNS HostName for a WebApp is working exactly in the same way in both Azure and Azure Stack, with both ownership and record check against a public Internet DNS server. That's pretty cool for public facing web applications, but represents a security issue for :
                      1)Intranet applications.(hosted on Azure or AzureStack)
                      - Custom Domain Names makes sence not only for Internet but Intranet too.
                      - We don't want to expose intranet application names publicly to the wild...
                      2)Multi-tenant AzureStack
                      - Each customer would like to have it's own custom domain for its applications, and not use the *.appservice.local.azurestack.external or…

                      1 vote
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                        0 comments  ·  Flag idea as inappropriate…  ·  Admin →

                        Hi,
                        thanks for the suggestion. I have marked this item as under review, please be advised it is only under review for Azure App Service on AZURE STACK.

                        This is not under review for Azure as the capability to host completely isolated intranet apps is only applicable to Internal Load Balanced App Service Environment, and as such the endpoints are only accessible internally meaning you can configure DNS within your organisation.

                        Regarding your point 2 – Multitenant Azure Stack, this approach is consistent with Azure in that a customer will always see sites deployed as mysite.appservice.. for example mysite.appservice.redmond.myazurestack.com but then can map a custom domain in the same way as is possible in Azure today. For example I can host a site www.mysite.com and set up records for that domain to point to mysiteinappservice.azurewebsites.net as per our documentation – https://docs.microsoft.com/en-gb/azure/app-service/app-service-custom-domain-name-migrate

                        Thanks

                        Andrew

                      • Aggregated logs for Linux App Service instances

                        To access logs for my Linux App Service instance i have to go to myapp.scm.azurewebsites.net/api/logs/docker and it lists all the instances i have running with a link to the log file for each node. This is cumbersome when trying to debug an issue. Could we have an option under diagnostic logs to target a storage Table and have these aggregated as one source

                        7 votes
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                          0 comments  ·  Flag idea as inappropriate…  ·  Admin →
                        • Display slots should list their full name in the resource lists.

                          When you are viewing resources in the "All Resources" blade or in the "Resource Group" blade all slots are just listed using only their slot name, if you have many different web apps that all use slots you will see the same name repeated several times (see "Example Resource Group.PNG").

                          I suggest you display the name from the resources blade the same way you display it in the delete menu if you are deleting the base web app "BaseName-SlotName" (See "delete example.PNG")

                          14 votes
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                            1 comment  ·  Flag idea as inappropriate…  ·  Admin →
                          • DNS resolution is not working in Azure Web App for Containers (linux)

                            DNS resolution is not working in Web App for Containers (linux) when using custom docker image. The DHCP generated resolv.conf is broken. After using SSH to log in to the container trying nslookup google.com also fails with DNS resolution error.

                            See my sample project for more details:

                            https://github.com/henkosch/azure-webapp-dnstest

                            The problem is also mentioned in the comments section on this page:

                            https://docs.microsoft.com/en-us/azure/app-service/containers/app-service-linux-faq

                            Does anyone have an idea how to fix this?

                            33 votes
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                              2 comments  ·  Bugs  ·  Flag idea as inappropriate…  ·  Admin →
                            • REST API shouldn't return 0 when it doesn't have the actual data

                              Calling the REST API to get CPU or memory usage of an app service plan, if you ask for it in the last minute it can return 0 to you, when a few minutes later it will return the actual value for the same time, it seems it takes a while for the real data to be available to the API, however I think it's wrong to return incorrect data, it should not return a value until it has the real value.

                              1 vote
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                                0 comments  ·  Bugs  ·  Flag idea as inappropriate…  ·  Admin →
                              • Web Apps should not return 500 error when attacker appends MS-DOS devices to URLs

                                If an attacker is trying to fingerprint your web server, perhaps looking for https://nvd.nist.gov/vuln/detail/CVE-2007-2897

                                He may try https://yourSite.azurewebsites.net/AUX or https://yourSite.azurewebsites.net/PRN

                                or any of the MS-DOS devices:

                                https://support.microsoft.com/en-us/help/74496/ms-dos-device-driver-names-cannot-be-used-as-file-names

                                Rather than return a 40x error, it returns a 500, and also leaks the server header "Server:Microsoft-IIS/8.0"

                                This is a bad situation to be in - throwing 500 errors, and leaking the server technology. Throwing 500 errors makes our sites more susceptible to DoS attacks? If an attacker sends 1000s of requests that throw 500 errors, the site will go offline in a short period of time?

                                0 votes
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                                  0 comments  ·  Bugs  ·  Flag idea as inappropriate…  ·  Admin →

                                  Hi there,

                                  Thanks for bringing this up!

                                  We will look into the leaked server header, but based on some testing, it is not trivial fix.

                                  The internal server error responses are not harming your application in any way and cannot be used for DoSing the site (your site will not go down because of these). Unfortunately, fixing the response itself to 4xx type of response might be more challenging and there is currently no timeline for that and it is in our backlog.

                                  We will update when there is work deployed to address the above.

                                  Thanks,
                                  Oded

                                • Option to migrate windows WebApp to linux WebApp

                                  I would like to migrate my existing azure app service web app (running on windows) to new app service Web App on Linux. Now I try to do it through backup and restore and the contents are not copied to the linux web app.

                                  3 votes
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                                    0 comments  ·  Flag idea as inappropriate…  ·  Admin →

                                    Thanks for that suggestion, can you please submit a support request to investigate why backup and restore didn’t copy the contents to the new linux web app.
                                    Note that backup and restore doesn’t move the *.azurewebsites.net hostname.

                                    Ahmed,
                                    App Service Team

                                  • App Service Environments Architecture and Cost

                                    I love using App Service Environments; however, the cost is shocking. We like that our App service can communicate over our express route to our data center. I gained some new understandings with how these services work on the back-end and it seems confusing. I have an understanding that normal App Service Plans operate such that a fault tolerant pair is available in a different part of the data center and in the event of a failure, your code is moved to the other pair. This is great and I love that. With ASE's the architecture changes and the use…

                                    6 votes
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                                      under review  ·  1 comment  ·  Flag idea as inappropriate…  ·  Admin →
                                    • HTTPS only without redirect

                                      This feature has been requested multiple times (like here: https://feedback.azure.com/forums/169385-web-apps/suggestions/6868536-provide-require-ssl-setting-for-azure-websites), but has been closed time after time with the same workaround. The workaround consists of adding a redirect rule to web.config.

                                      We however want a way to disable insecure HTTP requests completely.

                                      Think of an API that gets called by a React or Angular app. Calling the HTTP endpoint of the API would be a bug and might lead to sensitive information like the access token being send over HTTP. It would appear to work, because the request gets redirected to HTTPS, so the bug would be harder to…

                                      30 votes
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                                        0 comments  ·  Flag idea as inappropriate…  ·  Admin →
                                      • Add "Allow access to Azure services" in Azure App Service IP restrictions

                                        Re this thread

                                        https://www.yammer.com/azureadvisors/#/Threads/show?threadId=945875058

                                        I'd used PowerShell to manually add IP restrictions a couple of weeks ago. Right away my App Insights availability tests started failing so I narrowed the test location down to Dublin IE and allowed those IP/Subnets.

                                        Add an option similar to SQL Server "Allow access to Azure services" That white lists Azure App insights availability tests for selected regions.

                                        Thanks

                                        Luke

                                        21 votes
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                                          0 comments  ·  Deployment  ·  Flag idea as inappropriate…  ·  Admin →

                                          There was some confusion about this feature due to the documentation for it and UX originally released had a bug.

                                          The IP Restrictions feature works as an ALLOW list, rather than a DENY list as originally stated.

                                          The ask here is still valid, there are other services in azure (like SQL) that have UI to explicitly allow other azure services to reach the database. While this is convenient for development scenarios, it’s not a good idea for securing the resource.

                                          We’ll keep an eye on this request and see if it gathers more up-votes.

                                          -Byron

                                        • Optionally stop the web app while backing up

                                          Some of my web apps have embedded databases that block the files they use. That prevents the backup from storing them (well, it actually stores a 0 byte file instead). This is not a big handicap if I make the backups manually, because I know the issue and I stop the web apps manually, but if I want to automate the backup I can't because almost always these files are locked...

                                          One possible solution would be to add an option in the backup configuration to stop the web app before running and start it again after it has finished.

                                          Thanks!

                                          3 votes
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                                            0 comments  ·  Flag idea as inappropriate…  ·  Admin →
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