What is the effect of disable PUT verb in Sharepoint 2016

Question

I'm going to disable the http verbs through IIS request filtering for some of my site in Sharepoint 2016. what are the list of functionalities that may be affected if I disabled the PUT verb in sharepoint 2016? Is there an alternative other than disable the PUT method?

Answer 1

Hi @Nisahn ,
Since SharePoint is a web based application and it will use all standard verbs and HTTP methods(PUT, DELETE, GET, POST, ..etc.) in many SharePoint features, disabling Put methods will impact SharePoint functionality and feature.
SharePoint uses Http Put method whenever clients use Office applications to edit, upload documents, this feature will be impacted.
SharePoint uses the Http Put method to upload documents (Office or any other type of docs, for example PDFs) to document libraries in SharePoint sites, for this point we should be authenticated user. Anonymous users cannot modify document libraries.
Besides, to access the SharePoint services(REST/web) the user should be authenticated. Hence, for the PUT HTTP methods, they need to authenticate using a valid account. If that account has the permissions, then they will be able to upload a resource.

Here is the document for reference
https://learn.microsoft.com/en-us/iis/configuration/system.webServer/security/requestFiltering/verbs/

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Answer 2

as far as I know there is no such separate list of Sharepoint features which use PUT verb. You may try to run Fiddler and then use some basic features in Sharepoint (ad//update list items, upload file, edit file properties, edit pages, add web part etc). After that check in Fiddler which request used PUT.