Blazor WASM SEO issues

[keerthirajap]

Blazor WASM needs simple and quick solution on SEO for rendering Title, Meta and Link tags on Twitter and Facebook cards.

bing webmasters is showing errors on using PageTitle and HeadContent tags.

Provide inbuilt option for Robot.txt and sitemap.xml

[keerthirajap]

I temporarily resolved by using prerender.io and cloudflare.com services for the website launched in IIS, by following the blog : https://www.baskaran.dev/posts/2021/1/blazor-seo-prerendering

Pre-render with IIS is more efficient
https://github.com/dingyuliang/prerender-dotnet/wiki/Prerender-Configuration-in-IIS

Also please add 404 error pages

web.config

     <rules>         
	  
          
			
			
		  <rule name="Redirect to https" stopProcessing="true">
           <match url=".*" />
           <conditions>
              <add input="{HTTPS}" pattern="off" ignoreCase="true" />
           </conditions>
           <action type="Redirect" url="https://{HTTP_HOST}{REQUEST_URI}" redirectType="Permanent" appendQueryString="false" />
        </rule>
        <rule name="non-www to www" stopProcessing="true">
           <match url="(.*)" />
           <conditions>
              <add input="{HTTP_HOST}" pattern="^domain.com$" />
           </conditions>
           <action type="Redirect" url="https://www.domain.com/{R:1}" redirectType="Permanent" />
        </rule>


		 <rule name="RewriteSEO" stopProcessing="true">      
				<serverVariables>
                        <set name="HTTP_X_PRERENDER_TOKEN" value="your token" />
					</serverVariables>
					
                 <match url="^(?!.*?(\.js|\.css|\.xml|\.less|\.png|\.jpg|\.jpeg|\.gif|\.pdf|\.doc|\.txt|\.ico|\.rss|\.zip|\.mp3|\.rar|\.exe|\.wmv|\.doc|\.avi|\.ppt|\.mpg|\.mpeg|\.tif|\.wav|\.mov|\.psd|\.ai|\.xls|\.mp4|\.m4a|\.swf|\.dat|\.dmg|\.iso|\.flv|\.m4v|\.webmanifest|\.torrent))(.*)" ignoreCase="false" />
               
				<conditions logicalGrouping="MatchAny">
                        <add input="{QUERY_STRING}" pattern="(.*)_escaped_fragment_=(.*)" ignoreCase="false" />
                        <add input="{HTTP_USER_AGENT}" pattern="(baiduspider)|(facebookexternalhit)|(twitterbot)|(rogerbot)|(linkedinbot)|(embedly)|(quora link preview)|(showyoubot)|(outbrain)|(pinterest)|(google\\.com)|(slackbot)|(vkShare)|(W3C_Validator)|(redditbot)|(Applebot)|(WhatsApp)|(flipboard)|(tumblr)|(bitlybot)|(SkypeUriPreview)|(nuzzel)|(discordbot)|(Google Page Speed)|(x\\-bufferbot)|(qwantify)|(pinterestbot)|(bitrix link preview)|(xing-contenttabreceiver)|(chrome-lighthouse)|(telegrambot)|(bot)|(developers.google.com/+/web/snippet)|(googlebot)|(yahoo! slurp)|(bingbot)|(yandex)|(bot)|(spider)|(spyder)|(crawler)|(seobility)" />
                </conditions>
                <action type="Rewrite" url="{ToLower:https://service.prerender.io/https://www.domain.com/{R:2}}" appendQueryString="false" logRewrittenUrl="true" />
					
            </rule>
			
		 	 <rule name="Rewrite brotli file" stopProcessing="true">
			  <match url="(.*)" />
			  <conditions>
				<add input="{HTTP_ACCEPT_ENCODING}" pattern="br" />
				 <add input="{REQUEST_FILENAME}" pattern="\.(js|dat|dll|json|wasm|blat|htm|html|css|ico|svg)$" />
				<add input="{REQUEST_FILENAME}.br" matchType="IsFile" />
			  </conditions>
			  <action type="Rewrite" url="{R:1}.br" />
			</rule>		
	
		 <rule name="Rewrite gzip file" stopProcessing="true">
		  <match url="(.*)" />
		  <conditions>
			<add input="{HTTP_ACCEPT_ENCODING}" pattern="gzip" />
			<add input="{REQUEST_FILENAME}" pattern="\.(js|dat|dll|json|wasm|blat|htm|html|css|ico|svg)$" />
			<add input="{REQUEST_FILENAME}.gz" matchType="IsFile" />
		  </conditions>
		  <action type="Rewrite" url="{R:1}.gz" />
		</rule>	

     </rules>
  </rewrite>

[pranavkm]

Do you have prerendering enabled in your app? https://docs.microsoft.com/aspnet/core/blazor/components/prerendering-and-integration?view=aspnetcore-6.0&pivots=webassembly

[ghost]

Hi @keerthirajap. We have added the "Needs: Author Feedback" label to this issue, which indicates that we have an open question for you before we can take further action. This issue will be closed automatically in 7 days if we do not hear back from you by then - please feel free to re-open it if you come back to this issue after that time.

[keerthirajap]

I tried it, Its not working with dependency injection and Authentication, Authorization.

I am asking this support for WASM only, but your link says we need to have in server and client project.

[javiercn]

Closing this issue in favor of #27592 since it's a duplicate.

Please upvote the other feature instead.