Edit

Share via

Host and deploy ASP.NET Core Blazor WebAssembly with Apache

  • Article

Note

This isn't the latest version of this article. For the current release, see the .NET 9 version of this article.

Warning

This version of ASP.NET Core is no longer supported. For more information, see the .NET and .NET Core Support Policy. For the current release, see the .NET 9 version of this article.

Important

This information relates to a pre-release product that may be substantially modified before it's commercially released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

For the current release, see the .NET 9 version of this article.

This article explains how to host and deploy Blazor WebAssembly using Apache.

To deploy a Blazor WebAssembly app to Apache:

Create the Apache configuration file. The following example is a simplified configuration file (blazorapp.config):

<VirtualHost *:80>
    ServerName www.example.com
    ServerAlias *.example.com

    DocumentRoot "/var/www/blazorapp"
    ErrorDocument 404 /index.html

    AddType application/wasm .wasm

    <Directory "/var/www/blazorapp">
        Options -Indexes
        AllowOverride None
    </Directory>

    <IfModule mod_deflate.c>
        AddOutputFilterByType DEFLATE text/css
        AddOutputFilterByType DEFLATE application/javascript
        AddOutputFilterByType DEFLATE text/html
        AddOutputFilterByType DEFLATE application/octet-stream
        AddOutputFilterByType DEFLATE application/wasm
        <IfModule mod_setenvif.c>
            BrowserMatch ^Mozilla/4 gzip-only-text/html
            BrowserMatch ^Mozilla/4.0[678] no-gzip
            BrowserMatch bMSIE !no-gzip !gzip-only-text/html
        </IfModule>
    </IfModule>

    ErrorLog /var/log/httpd/blazorapp-error.log
    CustomLog /var/log/httpd/blazorapp-access.log common
</VirtualHost>

Create the Apache configuration file. The following example is a simplified configuration file (blazorapp.config):

<VirtualHost *:80>
    ServerName www.example.com
    ServerAlias *.example.com

    DocumentRoot "/var/www/blazorapp"
    ErrorDocument 404 /index.html

    AddType application/wasm .wasm
    AddType application/octet-stream .dll

    <Directory "/var/www/blazorapp">
        Options -Indexes
        AllowOverride None
    </Directory>

    <IfModule mod_deflate.c>
        AddOutputFilterByType DEFLATE text/css
        AddOutputFilterByType DEFLATE application/javascript
        AddOutputFilterByType DEFLATE text/html
        AddOutputFilterByType DEFLATE application/octet-stream
        AddOutputFilterByType DEFLATE application/wasm
        <IfModule mod_setenvif.c>
            BrowserMatch ^Mozilla/4 gzip-only-text/html
            BrowserMatch ^Mozilla/4.0[678] no-gzip
            BrowserMatch bMSIE !no-gzip !gzip-only-text/html
        </IfModule>
    </IfModule>

    ErrorLog /var/log/httpd/blazorapp-error.log
    CustomLog /var/log/httpd/blazorapp-access.log common
</VirtualHost>

Place the Apache configuration file into the /etc/httpd/conf.d/ directory.

Place the app's published assets (/bin/Release/{TARGET FRAMEWORK}/publish/wwwroot, where the {TARGET FRAMEWORK} placeholder is the target framework) into the /var/www/blazorapp directory (the location specified to DocumentRoot in the configuration file).

Restart the Apache service.

For more information, see mod_mime and mod_deflate.

Hosted deployment on Linux (Apache)

Configure the app with ForwardedHeadersOptions to forward the X-Forwarded-For and X-Forwarded-Proto headers by following the guidance in Configure ASP.NET Core to work with proxy servers and load balancers.

For more information on setting the app's base path, including sub-app path configuration, see ASP.NET Core Blazor app base path.

The following example hosts the app at a root URL (no sub-app path):

<VirtualHost *:*>
    RequestHeader set "X-Forwarded-Proto" expr=%{REQUEST_SCHEME}
</VirtualHost>

<VirtualHost *:80>
    ProxyPreserveHost On
    ProxyPass         / http://localhost:5000/
    ProxyPassReverse  / http://localhost:5000/
    ProxyPassMatch    ^/_blazor/(.*) http://localhost:5000/_blazor/$1
    ProxyPass         /_blazor ws://localhost:5000/_blazor
    ServerName        www.example.com
    ServerAlias       *.example.com
    ErrorLog          ${APACHE_LOG_DIR}helloapp-error.log
    CustomLog         ${APACHE_LOG_DIR}helloapp-access.log common
</VirtualHost>

To configure the server to host the app at a sub-app path, the {PATH} placeholder in the following entires is the sub-app path:

<VirtualHost *:*>
    RequestHeader set "X-Forwarded-Proto" expr=%{REQUEST_SCHEME}
</VirtualHost>

<VirtualHost *:80>
    ProxyPreserveHost On
    ProxyPass         / http://localhost:5000/{PATH}
    ProxyPassReverse  / http://localhost:5000/{PATH}
    ProxyPassMatch    ^/_blazor/(.*) http://localhost:5000/{PATH}/_blazor/$1
    ProxyPass         /_blazor ws://localhost:5000/{PATH}/_blazor
    ServerName        www.example.com
    ServerAlias       *.example.com
    ErrorLog          ${APACHE_LOG_DIR}helloapp-error.log
    CustomLog         ${APACHE_LOG_DIR}helloapp-access.log common
</VirtualHost>

For an app that responds to requests at /blazor:

<VirtualHost *:*>
    RequestHeader set "X-Forwarded-Proto" expr=%{REQUEST_SCHEME}
</VirtualHost>

<VirtualHost *:80>
    ProxyPreserveHost On
    ProxyPass         / http://localhost:5000/blazor
    ProxyPassReverse  / http://localhost:5000/blazor
    ProxyPassMatch    ^/_blazor/(.*) http://localhost:5000/blazor/_blazor/$1
    ProxyPass         /_blazor ws://localhost:5000/blazor/_blazor
    ServerName        www.example.com
    ServerAlias       *.example.com
    ErrorLog          ${APACHE_LOG_DIR}helloapp-error.log
    CustomLog         ${APACHE_LOG_DIR}helloapp-access.log common
</VirtualHost>

Additional resources