文件上传

1.Content-type

靠苏接收方如何解析和处理传输的内容，但实际环境中服务器可能依赖于文件的扩展名来据欸的那个如何处理文件，而不完全依赖content-type|或者配置了php解析规则，且没有严格检查文件的MIME类型

application/x-httpd-php
text/php
application/php
text/x-php
application/x-php
text/asp
application/asp
text/html
application/x-aspx
text/x-aspx
application/octet-stream
application/x-msdownload
application/vnd.ms-aspx
application/x-jsp
text/x-jsp
image/jpeg
image/png
image/gif
text/plain
application/octet-stream
multipart/form-data
application/x-www-form-urlencoded
application/json
application/xml
text/xml
application/javascript
text/css
text/csv
application/pdf
application/zip
application/msword
application/vnd.ms-excel