1）
2）
(1) Open the server IIS manager and find the MIME type.
Add MIME type add:
File extension MIME type .svg image / svg + xml .woff application / x-font-woff .woff2 application / x-font-woff .json application / json
(2) But: json file to continue
Open "Processor Mapping", click "Add Script Mapping", request path to write "* .json" [don't quotes], the
executable file is "C: \ Windows \ System32 \ inetsrv \ asp.dll" [Locate through the browse window This file],
write "JSON" in the name, and then open the request limit-predicate-one of the following predicates, fill in "GET, POST" [don't quotes], after two confirmations, a prompt will pop up, click "Yes",
and restart Computer
3) Then add in the web.config file
<system.webServer>
<staticContent>
<mimeMap fileExtension=".json" mimeType="application/json; charset=UTF-8" />
</staticContent>
</system.webServer>