Add HTTP Headers to HTML Page Request

EVO HTML to PDF Converter for .NET Documentation

EVO HTML to PDF Converter allows you to add HTTP headers when you request the HTML page. There are various standard HTTP headers offering important information to web server about the capabilities of the browser like the accepted content type, accepted encoding, accepted language, connection mode, user agent.

The HTTP headers to be used when the HTML page to convert is requested can be added to HtmlToPdfConverterHttpRequestHeaders collection.

Code Sample - Add HTTP Headers to HTML Page Request

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protected void convertToPdfButton_Click(object sender, EventArgs e)
{
    // Create a HTML to PDF converter object with default settings
    HtmlToPdfConverter htmlToPdfConverter = new HtmlToPdfConverter();

    // Set license key received after purchase to use the converter in licensed mode
    // Leave it not set to use the converter in demo mode
    htmlToPdfConverter.LicenseKey = "4W9+bn19bn5ue2B+bn1/YH98YHd3d3c=";

    // Set an adddional delay in seconds to wait for JavaScript or AJAX calls after page load completed
    // Set this property to 0 if you don't need to wait for such asynchcronous operations to finish
    htmlToPdfConverter.ConversionDelay = 2;

    // Add custom HTTP headers

    if (header1NameTextBox.Text.Length > 0 && header1ValueTextBox.Text.Length > 0)
        htmlToPdfConverter.HttpRequestHeaders.Add(header1NameTextBox.Text, header1ValueTextBox.Text);

    if (header2NameTextBox.Text.Length > 0 && header2ValueTextBox.Text.Length > 0)
        htmlToPdfConverter.HttpRequestHeaders.Add(header2NameTextBox.Text, header2ValueTextBox.Text);

    if (header3NameTextBox.Text.Length > 0 && header3ValueTextBox.Text.Length > 0)
        htmlToPdfConverter.HttpRequestHeaders.Add(header3NameTextBox.Text, header3ValueTextBox.Text);

    if (header4NameTextBox.Text.Length > 0 && header4ValueTextBox.Text.Length > 0)
        htmlToPdfConverter.HttpRequestHeaders.Add(header4NameTextBox.Text, header4ValueTextBox.Text);

    if (header5NameTextBox.Text.Length > 0 && header5ValueTextBox.Text.Length > 0)
        htmlToPdfConverter.HttpRequestHeaders.Add(header5NameTextBox.Text, header5ValueTextBox.Text);

    // Convert the HTML page to a PDF document in a memory buffer
    byte[] outPdfBuffer = htmlToPdfConverter.ConvertUrl(urlTextBox.Text);

    // Send the PDF as response to browser

    // Set response content type
    Response.AddHeader("Content-Type", "application/pdf");

    // Instruct the browser to open the PDF file as an attachment or inline
    Response.AddHeader("Content-Disposition", String.Format("attachment; filename=HTTP_Headers.pdf; size={0}", outPdfBuffer.Length.ToString()));

    // Write the PDF document buffer to HTTP response
    Response.BinaryWrite(outPdfBuffer);

    // End the HTTP response and stop the current page processing
    Response.End();
}

Protected Sub convertToPdfButton_Click(ByVal sender As Object, ByVal e As EventArgs)
    ' Create a HTML to PDF converter object with default settings
    Dim htmlToPdfConverter As New HtmlToPdfConverter()

    ' Set license key received after purchase to use the converter in licensed mode
    ' Leave it not set to use the converter in demo mode
    htmlToPdfConverter.LicenseKey = "4W9+bn19bn5ue2B+bn1/YH98YHd3d3c="

    ' Set an adddional delay in seconds to wait for JavaScript or AJAX calls after page load completed
    ' Set this property to 0 if you don't need to wait for such asynchcronous operations to finish
    htmlToPdfConverter.ConversionDelay = 2

    ' Add custom HTTP headers

    If header1NameTextBox.Text.Length > 0 AndAlso header1ValueTextBox.Text.Length > 0 Then
        htmlToPdfConverter.HttpRequestHeaders.Add(header1NameTextBox.Text, header1ValueTextBox.Text)
    End If

    If header2NameTextBox.Text.Length > 0 AndAlso header2ValueTextBox.Text.Length > 0 Then
        htmlToPdfConverter.HttpRequestHeaders.Add(header2NameTextBox.Text, header2ValueTextBox.Text)
    End If

    If header3NameTextBox.Text.Length > 0 AndAlso header3ValueTextBox.Text.Length > 0 Then
        htmlToPdfConverter.HttpRequestHeaders.Add(header3NameTextBox.Text, header3ValueTextBox.Text)
    End If

    If header4NameTextBox.Text.Length > 0 AndAlso header4ValueTextBox.Text.Length > 0 Then
        htmlToPdfConverter.HttpRequestHeaders.Add(header4NameTextBox.Text, header4ValueTextBox.Text)
    End If

    If header5NameTextBox.Text.Length > 0 AndAlso header5ValueTextBox.Text.Length > 0 Then
        htmlToPdfConverter.HttpRequestHeaders.Add(header5NameTextBox.Text, header5ValueTextBox.Text)
    End If

    ' Convert the HTML page to a PDF document in a memory buffer
    Dim outPdfBuffer() As Byte = htmlToPdfConverter.ConvertUrl(urlTextBox.Text)

    ' Send the PDF as response to browser

    ' Set response content type
    Response.AddHeader("Content-Type", "application/pdf")

    ' Instruct the browser to open the PDF file as an attachment or inline
    Response.AddHeader("Content-Disposition", String.Format("attachment; filename=HTTP_Headers.pdf; size={0}", outPdfBuffer.Length.ToString()))

    ' Write the PDF document buffer to HTTP response
    Response.BinaryWrite(outPdfBuffer)

    ' End the HTTP response and stop the current page processing
    Response.End()
End Sub