比较直观的HTTP Chunked编码介绍

Sample

Encoded response

HTTP/1.1 200 OK
Content-Type: text/plain
Transfer-Encoding: chunked

25
This is the data in the first chunk

1A
and this is the second one
0

same as above, raw bytes in hex

0000-000F   48 54 54 50 2f 31 2e 31 20 32 30 30 20 4f 4b 0d   HTTP/1.1 200 OK.
0010-001F   0a 43 6f 6e 74 65 6e 74 2d 54 79 70 65 3a 20 74   .Content-Type: t
0020-002F   65 78 74 2f 70 6c 61 69 6e 0d 0a 54 72 61 6e 73   ext/plain..Trans
0030-003F   66 65 72 2d 45 6e 63 6f 64 69 6e 67 3a 20 63 68   fer-Encoding: ch
0040-004F   75 6e 6b 65 64 0d 0a 0d 0a 32 35 0d 0a 54 68 69   unked....25..Thi
0050-005F   73 20 69 73 20 74 68 65 20 64 61 74 61 20 69 6e   s is the data in
0060-006F   20 74 68 65 20 66 69 72 73 74 20 63 68 75 6e 6b    the first chunk
0070-007F   0d 0a 0d 0a 31 41 0d 0a 61 6e 64 20 74 68 69 73   ....1A..and this
0080-008F   20 69 73 20 74 68 65 20 73 65 63 6f 6e 64 20 6f    is the second o
0090-009F   6e 65 0d 0a 30 0d 0a 0d 0a                        ne..0....

same as above, in Java code

public static final byte[] CHUNKED_RESPONSE;
static {		 
	StringBuilder sb = new StringBuilder();
	sb.append("HTTP/1.1 200 OK\r\n");
	sb.append("Content-Type: text/plain\r\n");
	sb.append("Transfer-Encoding: chunked\r\n\r\n");
	sb.append("25\r\n");		
	sb.append("This is the data in the first chunk\r\n"); // 37 bytes of payload
			// (conveniently consisting of ASCII characters only)
	sb.append("\r\n1A\r\n");
	sb.append("and this is the second one"); // 26 bytes of payload
			// (conveniently consisting of ASCII characters only)
	sb.append("\r\n0\r\n\r\n");
	CHUNKED_RESPONSE = sb.toString().getBytes(java.nio.charset.Charset.forName("US-ASCII"));
}

Decoded data

This is the data in the first chunk
and this is the second one

基本上checked的编码方式。

评论

1 楼 huangshazsw 2010-06-25  

WTK的模拟器发送大字段文本的时候 就是因为这个chuncked而导致服务器那边接收到的内容长度为-1。有时候这个会引起问题，不过真机上还没遇到过