It is the same, you would observed that, initially there is a POST, when server responded with HTTP/1.1 302 Object moved, then it try a GET, this caused that 405 error.

So why would it encounter a 302? The object is moved to the same location

POST http://www.foongshoon.org/DesktopModu... HTTP/1.1
Host: www.foongshoon.org
Connection: keep-alive
Content-Length: 52
TabId: 157
RequestVerificationToken: O2cwmqFN5MMXfUH4MXCO-CpLh5zR20RD7XdOeYom37FUDg1YplxzaICFEGS-dDSO53nng_AMq372wj6dd69PH8Qx1QwMFIpBpMILghu3LEfcCB4asOA6DE610WHuR7FBTtZjNg2
Origin: http://www.foongshoon.org
User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/43.0.2357.81 Safari/537.36
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
Accept: */*
X-Requested-With: XMLHttpRequest
ModuleId: 587
Referer: http://www.foongshoon.org/Admin/FileM...
Accept-Encoding: gzip, deflate
Accept-Language: en-GB,en-US;q=0.8,en;q=0.6
Cookie: .ASPXANONYMOUS=nRNhN0TN0AEkAAAAYWY0YjJjYmEtZmZhMi00N2EyLTg3YmEtNmVlM2Q2NjJkZjc50; __RequestVerificationToken=OEgWd30F3gwf6kVChdUt3SD-sNA-sp3njEu0B3mKZVmuZl_4i--kD0ppDJLbFR4_vMTQQ4YLfci1AiwrpKIz3BK4KdP94Dn9F21yJ2iAVAT5pLr46XxssKcCZDE1; USERNAME_CHANGED=; authentication=DNN; .DOTNETNUKE=8C5B9D308C459AFA0A3520D82174B2DA4904671200196C0CE9C6419C2BEC58888DC8EF7D4C6AB4BEEF1B22467708DD93517085DF9AE57ABD08E4BF326C593CA0A5E9338B43D3748ADA638F2C115B1CDC6036FB15F056593CE1AE89FC84FCDB36403D18C0; language=zh-CN; LastPageId=0:157; StayInEditMode=NO

folderId=20&startIndex=0&numItems=10&sortExpression=








HTTP/1.1 302 Object moved
Cache-Control: no-cache
Pragma: no-cache
Content-Length: 281
Content-Type: text/html
Location: http://www.foongshoon.org/DesktopModu...
Server: Microsoft-IIS/7.0
X-Powered-By: ASP.NET
node: 93
Date: Fri, 29 May 2015 14:54:52 GMT

The requested resource was moved. It could be found here: http://www.foongshoon.org/DesktopModu...>http://www.foongshoon.org/DesktopModu...