1リクエストで大量のファイルをアップロード出来ない問題を解決するのが大変だった話

<configuration>
    <system.webServer>
        <security>
          <requestFiltering>
            <requestLimits maxAllowedContentLength="1073741824" />
          </requestFiltering>
        </security>
    <system.webServer>
</configuration>    

<configuration>
    <system.web>
        <httpRuntime maxRequestLength="1048576" />
    </system.web>
<configuration>  

FILTER_START FilterName="C:\Windows\system32\inetsrv\urlscan\urlscan.dll"

FILTER_SET_REQ_HEADER HeaderName="URLSCAN-STATUS-HEADER:"、HeaderValue="Content-length-too-long"

GENERAL_REQUEST_HEADERS Headers="Cache-Control: no-cache

Connection: close
Content-Length: 0
Content-Type: multipart/form-data; boundary=---------------------------7e21c9181f09b6
Accept: text/html、application/xhtml+xml、*/*
Accept-Encoding: gzip、deflate
Accept-Language: ja-JP
URLSCAN-STATUS-HEADER: Content-length-too-long

#Software: Microsoft UrlScan 3.1
#Version: 1.0
#Date: 2018-06-07 06:30:42
#Fields: Date Time c-ip s-siteid cs-method cs-uri x-action x-reason x-context cs-data x-control
2018-06-07 06:31:24 10.94.33.151 1 POST /example/fileupload Rejected Content+length+too+long Content-Length: 203675502 100000000

[RequestLimits]

;
; The entries in this section impose limits on the length
; of allowed parts of requests reaching the server.
;
; It is possible to impose a limit on the length of the
; value of a specific request header by prepending "Max-" to the
; name of the header.  For example、the following entry would
; impose a limit of 100 bytes to the value of the
; 'Content-Type' header:
;
;   Max-Content-Type=100
;
; Any headers not listed in this section will not be checked for
; length limits.
;
; There are 3 special case limits:
;
;   - MaxAllowedContentLength specifies the maximum allowed
;     numeric value of the Content-Length request header.  For
;     example、setting this to 1000 would cause any request
;     with a content length that exceeds 1000 to be rejected.
;     The default is 30000000.
;
;   - MaxUrl specifies the maximum length of the request URL,
;     not including the query string. The default is 260 (which
;     is equivalent to MAX_PATH).
;
;   - MaxQueryString specifies the maximum length of the query
;     string.  The default is 2048.
;

MaxAllowedContentLength=100000000
MaxUrl=26000
MaxQueryString=2048000