WebKit Converter blank page

Question

Hi,I'm workink with HtmlToPdfConverter to create a invoice PDF.I have this invoice in HTML and work very well, but when I try converter dont work. I try another https pages  and work well, but in my site don't work.I tried these web pages:https://www.google.com.brhttps://www.microsoft.com.brI use Azure Web Apps and Blazor and I try converter others azure websites and worked very well.I have OPENSSL in my project too.My code:MemoryStream stream = new MemoryStream();
//Initialize HTML to PDF converter
HtmlToPdfConverter htmlConverter = new HtmlToPdfConverter();
WebKitConverterSettings settings = new WebKitConverterSettings();
//Set WebKit path
settings.WebKitPath = Startup.contentRootPath + @"\Biblio\QtBinariesDotNetCore\";
//Assign WebKit settings to HTML converter
settings.AdditionalDelay = 3000;
htmlConverter.ConverterSettings = settings;
//Convert HTML to PDF.
string url = "https://webclient.irineu.dev.sic360.com/";
PdfDocument document = htmlConverter.Convert(url);
 
 
//Save and close the document instance.
document.Save(stream);
document.Close(true);
stream.Position = 0;

Gowthamraj Kumar · Accepted Answer

Hi Thomaz, 

Thank you for your patience. 

As we said earlier, to access the resource from HTTPS site, the HTML converter requires OPENSSL assemblies. By default, some Azure websites do not have the OPENSSL assemblies. So, these assemblies should be added to the website explicitly. Please refer below links to add OPENSSL assemblies to Azure website.   
KB: https://www.syncfusion.com/kb/8821/blank-pdf-is-generated-when-converting-https-sites-to-pdf-in-azure 
Openssl - https://help.syncfusion.com/file-formats/pdf/convert-html-to-pdf/webkit#openssl  

We have created a sample for converting provided URL to PDF using WebKit in Azure, it is generate a login page properly as it looks like in web browsers. We have attached the runnable sample, host link and output document for your reference. Kindly please try the sample in your end and let us know the result. 

Sample: https://www.syncfusion.com/downloads/support/forum/161922/ze/HtmlToPDF_Blazor1351796612  
Host Link: https://htmltopdfblazor20210202185632.azurewebsites.net/fetchdata 
Document:  https://www.syncfusion.com/downloads/support/forum/161922/pd/Sample1946345853  

Note: The above hosted link will be expired in two days. In this host link, click html to pdf button to generate PDF document. 

Please let us know if you need any further assistance with this. 

Regards, 
Gowthamraj K

Gowthamraj Kumar · Answer

Hi Thomaz, 
 
Thank you for contacting Syncfusion support. 
 
When converting HTTPS sites, blank paged PDF may occur due to the missing of the OPENSSL assemblies in the Azure website. To convert HTTPS sites, the converter requires OPENSSL assemblies. By default, some Azure websites do not have the OPENSSL assemblies. So, these assemblies should be added to the website explicitly. We could not place the assemblies in the system drive on the Azure App service environment. Refer to the below steps to place the OPENSSL assemblies in Azure for converting HTTPS sites to PDF.    


Create a new folder in a project and copy the OPENSSL assemblies to that folder.

libeay32.dll
libssl32.dll
ssleay32.dll

Include that folder in a project and set copy to the output directory as “Copy always”.
Get the path of the OPENSSL assemblies folder in C# and set it to the environment variable.
 
Refer below link for more information about adding OPENSSL assemblies in Azure. 
KB: https://www.syncfusion.com/kb/8821/blank-pdf-is-generated-when-converting-https-sites-to-pdf-in-azure  
Prerequisites - https://help.syncfusion.com/file-formats/pdf/convert-html-to-pdf/webkit#openssl  
Troubleshooting - https://help.syncfusion.com/file-formats/pdf/converting-html-to-pdf#troubleshooting 
 
If still, you are facing the same issue, kindly please provide us the below details to reproduce the issue on our end. So, that it will be helpful for us to analyze and provide you the solution at the earliest.   
   

Azure subscription details and published profile details (Region, Size, hosting plans, etc.,),
Simple sample with steps to reproduce the issue.
Produce version.
 
Regards, 
Gowthamraj K

Thomaz Lima · Answer

Hi,My azure region is East US, hosting plans B1.How I said before it's worked with others website, but with this Blazor website not.Do you can make a sample for me? A Blazor Server App where use net  5.0 and convert html to pdfMy code is on first message.Regards

Sowmiya Loganathan · Answer

Hi Thomaz, 

Thank you for your update. 

We were able to reproduce the reported “Blank page issue occurs while converting particular URL to PDF using WebKit” in our end. Currently, we are validating on this and we will update the further details on February 01, 2021.  

Regards, 
Sowmiya L