The error " The resource doesn't support specified Http Verb" usually occurs if you are trying to use wrong http verb while accessing the file.
A lot of content on webservices you need to use POST
verb to consume.
Try to clear unused or old files in the folder
While specifying the folder name make sure you have a forward slash on the end of URL.
Try including the CORS configuration as below,
<CorsRule>
<AllowedOrigins>*</AllowedOrigins>
<AllowedMethods>PUT,GET</AllowedMethods>
<AllowedHeaders>*</AllowedHeaders>
<ExposedHeaders>*</ExposedHeaders>
<MaxAgeInSeconds>200</MaxAgeInSeconds>
</CorsRule>
- If still the issue persists, add below lines in IIS webconfig,
<httpErrors>
<remove statusCode="405" subStatusCode="-1" />
<error statusCode="405" prefixLanguageFilePath="" path="/my-page.htm" responseMode="ExecuteURL" />
</httpErrors>
Please find below links if they are helpful.
References:
Ref1,
Ref2,
Ref3,
Ref4