I am trying to convert a large html file into pdf and it is timing out. The file is 22 MB file .
Is this a known issue and what is the resolution?
Thanks
Kapil
I am using
Here is the code
public byte[] ConvertHtmlToPdf(byte[] htmlBytes)
{
// Add timeout capability
var timeoutMs = 120000; // 2 minute timeout
var task = Task.Run(() =>
{
try
{
// Convert HTML bytes to string
string htmlContent = System.Text.Encoding.UTF8.GetString(htmlBytes);
string sanitizedHtml = SanitizeHtml(htmlContent);
byte[] sanitizedBytes = Encoding.UTF8.GetBytes(sanitizedHtml);
Console.WriteLine($"HTML size: {htmlBytes.Length} bytes");
Console.WriteLine($"Sanitized HTML size: {sanitizedBytes.Length} bytes");
// Create HTML load options with appropriate settings
var htmlOptions = new HtmlLoadOptions
{
IsEmbedFonts = false,
// Note: PageSetup.AnyPage can be used for uniform margins
PageInfo = new PageInfo
{
Width = 595, // A4 width in points
Height = 842, // A4 height in points
Margin = new MarginInfo
{
Top = 72,
Left = 72,
Right = 72,
Bottom = 72
}
}
};
using (var htmlStream = new MemoryStream(sanitizedBytes))
using (var pdfDocument = new Document(htmlStream, htmlOptions))
using (var outputStream = new MemoryStream())
{
// Save options
var saveOptions = new Aspose.Pdf.PdfSaveOptions();
pdfDocument.Save(outputStream, saveOptions);
return outputStream.ToArray();
}
}
catch (Exception ex)
{
Console.WriteLine("Error converting HTML to PDF: " + ex.Message);
if (ex.InnerException != null)
{
Console.WriteLine("Inner exception: " + ex.InnerException.Message);
}
throw;
}
});
// Wait for the task to complete with timeout
if (task.Wait(timeoutMs))
{
return task.Result;
}
else
{
throw new TimeoutException("HTML to PDF conversion timed out after " + timeoutMs / 1000 + " seconds");
}
}
@kshah05
Converting a large HTML file (like your 22 MB file) to PDF can sometimes lead to timeouts, especially if the conversion process is resource-intensive. Here are some strategies you can consider to resolve this issue:
-
Increase Timeout Duration: You can increase the timeout duration in your code. Currently, you have set it to 2 minutes (120,000 milliseconds). If possible, try extending this duration to allow more time for the conversion to complete.
-
Optimize HTML Content: Before conversion, ensure that the HTML content is optimized. This includes:
- Reducing the size of images or using lower resolution images.
- Minimizing the use of external resources (like CSS and JavaScript) that may slow down the rendering process.
- Cleaning up any unnecessary HTML tags or scripts.
-
Use HtmlLoadOptions: You are already using HtmlLoadOptions in your code. Make sure to configure it properly to suit your needs. For instance, if you don’t need to embed fonts, you can set IsEmbedFonts to false, which you have already done.
-
Memory Management: Ensure that your application has enough memory allocated for the conversion process. If you’re running this in a constrained environment, consider increasing the memory limits.
-
Asynchronous Processing: If the conversion is still timing out, consider processing the conversion asynchronously or in a background service, allowing your application to handle other tasks while waiting for the conversion to complete.
-
Check for Errors: Make sure to log any exceptions that occur during the conversion process. This can help identify specific issues that may be causing the timeout.
Here’s a slightly modified version of your code that includes an increased timeout and some logging for better error handling:
public byte[] ConvertHtmlToPdf(byte[] htmlBytes)
{
var timeoutMs = 300000; // Increased to 5 minutes
var task = Task.Run(() =>
{
try
{
string htmlContent = System.Text.Encoding.UTF8.GetString(htmlBytes);
string sanitizedHtml = SanitizeHtml(htmlContent);
byte[] sanitizedBytes = Encoding.UTF8.GetBytes(sanitizedHtml);
using (var htmlStream = new MemoryStream(sanitizedBytes))
{
var htmlOptions = new HtmlLoadOptions
{
IsEmbedFonts = false,
PageInfo = new PageInfo
{
Width = 595,
Height = 842,
Margin = new MarginInfo
{
Top = 72,
Left = 72,
Right = 72,
Bottom = 72
}
}
};
using (var pdfDocument = new Document(htmlStream, htmlOptions))
using (var outputStream = new MemoryStream())
{
var saveOptions = new Aspose.Pdf.PdfSaveOptions();
pdfDocument.Save(outputStream, saveOptions);
return outputStream.ToArray();
}
}
}
catch (Exception ex)
{
Console.WriteLine("Error converting HTML to PDF: " + ex.Message);
if (ex.InnerException != null)
{
Console.WriteLine("Inner exception: " + ex.InnerException.Message);
}
throw;
}
});
if (task.Wait(timeoutMs))
{
return task.Result;
}
else
{
throw new TimeoutException("HTML to PDF conversion timed out after " + timeoutMs / 1000 + " seconds");
}
}
By implementing these strategies, you should be able to improve the performance of your HTML to PDF conversion and reduce the likelihood of timeouts. If the problem persists, consider reaching out to Aspose support for further assistance.
What is the threhold max file size Aspose can convert html to pdf before timing out?
@kshah05
We are looking into it and will be sharing our feedback with you shortly.
@kshah05
There is no such limitation for file size or content in the API related to HTML to PDF Conversion. We need to investigate why it is failing at your end. Please share your sample HTML (.zip) with us by uploading it to Google Drive. We will test the scenario in our environment and address it accordingly.
Here is the file
Thanks
large_file.zip (2.0 MB)
@kshah05
Looks like this same issue has been addressed in the other forum thread opened by you. You may please follow up there.