Based on the information provided in the Sitecore documentation,


I am encountering an error related to a missing using directive or assembly reference when attempting to create a proof of concept (POC). Specifically, the error is related to the line of code:

var certificateModifier = new CertificateWebRequestHandlerModifier(options);

Can you please let me know the namespace that needs to be imported?

2 Answers 2


From the mentioned link, Can you please replace the piece of code with the followings and verify:

 var xdbCollectionCert = "StoreName=My;StoreLocation=LocalMachine;FindType=FindByThumbprint;FindValue=15E6693B0AECB63DE57D991EC363CA462DC52432";
 var options = CertificateHttpClientHandlerModifierOptions.Parse(xdbCollectionCert);

 var certificateModifier = new CertificateHttpClientHandlerModifier(options);

also instead of

var certificateModifier = new CertificateWebRequestHandlerModifier(options);

try with and verify. Hope it helps you.

 var certificateModifier = new CertificateHttpClientHandlerModifier(options);

If you will check the Sitecore.Xdb.Common.Web namespace you will find that CertificateWebRequestHandlerModifier renamed with CertificateHttpClientHandlerModifier. enter image description here


It lives in Sitecore.Xdb.Common.Web.

using Sitecore.Xdb.Common.Web;

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