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依照網(wǎng)路的教學(xué)用Python寫CGI上傳文件，一直出現(xiàn)500，怎麼回事？

html檔:

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>文件上傳</title>
</head>
<body>
    <form enctype="multipart/form-data" action="save_file.py" method="post">
        <p>
            選中文件: <input type="file" name="filename" />
        </p>
        <p>
            <input type="submit" value="上傳"/>
        </p>
    </form>
</body>
</html>

.py檔

#!/usr/bin/python
# -*- coding:utf-8 -*-

import cgi, os
import cgitb; cgitb.enable()

# 獲取文件名
f = cgi.FiledStorage().getvalue('filename')

# 檢測文件是否上傳
if f is not  None:
    # 設(shè)置文件路徑
    fn = os.path.basename(f.filename.replace("","/"))
    open('/tmp/' + fn,'wb').write(f.file.read())

    message = '文件 "' + fn + '" 上傳成功'

else:
    message = "文件沒有上傳"

print """
    Content-Type:text/html
    <html>
        <head>
            <meta charset="utf-8">
            <title>文件上傳</title>
        </head>
        <body>
            <p> %s </p>
        </body>
    </html>
""" % (message,)

錯誤訊息:

[Thu May 11 10:24:46.697197 2017] [http:error] [pid 8254] [client 127.0.0.1:58072] AH02429: Response header name '<!--' contains invalid characters, aborting request, referer: http://studycgi/file/file.html

127.0.0.1 - - [11/May/2017:10:24:41 +0800] "POST /file/save_file.py HTTP/1.1" 500 4063