【HTTP】另类的POST头数据 RFC1867协议格式简析

因为RFC1867增加了文件上传的功能，而上传文件内容自然也会被加入到HTTP的实体中。现在因为既有HTTP一般的参数实体，又有上传文件的实体，所以用boundary把每种实体进行了分割，HTTP的实体看起来将是类似下面的样子：  

-----------------------------7d71f4234700b8
Content-Disposition: form-data; name="formhash"

59329e15
-----------------------------7d71f4234700b8
Content-Disposition: form-data; name="isblog"

-----------------------------7d71f4234700b8
Content-Disposition: form-data; name="fid"

104
-----------------------------7d71f4234700b8
Content-Disposition: form-data; name="subject"

test
-----------------------------7d71f4234700b8
Content-Disposition: form-data; name="iconid"

0
-----------------------------7d71f4234700b8
Content-Disposition: form-data; name="usesig"

1
-----------------------------7d71f4234700b8
Content-Disposition: form-data; name="message"

test
-----------------------------7d71f4234700b8
Content-Disposition: form-data; name="attachperm[]"

0
-----------------------------7d71f4234700b8
Content-Disposition: form-data; name="attachdesc[]"

-----------------------------7d71f4234700b8
Content-Disposition: form-data; name="attach[]"; filename=""
Content-Type: application/octet-stream

-----------------------------7d71f4234700b8
Content-Disposition: form-data; name="attachperm[]"

0
-----------------------------7d71f4234700b8
Content-Disposition: form-data; name="attachdesc[]"

-----------------------------7d71f4234700b8
Content-Disposition: form-data; name="attach[]"; filename=""
Content-Type: application/octet-stream

-----------------------------7d71f4234700b8
Content-Disposition: form-data; name="wysiwyg"

1
-----------------------------7d71f4234700b8--

很明显，增加了文件上传后，HTTP实体变得稍微复杂了，首先是通过boundary把实体分开，以便于读取，然后对FileUpload的格式也作了限制。

4、那么同样，这种格式也是需要提供Content-Length属性的，那么和简单的post数据头相比较，就可以发现，变化的地方有：

......

Content-Type:

......
Content-Length:

......

数据体 goes here~

注意到这几个地方的变化后，就可以像往常一样post了