❤️💕💕计算机网络--TCP/IP 学习。Myblog:http://nsddd.top
[TOC]
curl -I nsddd.top
curl是一个在命令行下工作的文件传输工具，我们在这里用来发送HTTP请求。
-I大写的i表示仅返回头部信息。- 这个过程包含了TCP的三次握手和四次挥手。
C:\Users\smile>curl -I nsddd.top
HTTP/1.1 403 Forbidden
Server: nginx
Date: Sun, 24 Jul 2022 06:38:18 GMT
Content-Type: text/html; charset=UTF-8
Connection: keep-alive
Vary: Accept-Encoding
C:\Users\smile>Ping nsddd.top
正在 Ping nsddd.top [110.42.175.115] 具有 32 字节的数据:
来自 110.42.175.115 的回复: 字节=32 时间=38ms TTL=52
110.42.175.115 的 Ping 统计信息:
数据包: 已发送 = 1，已接收 = 1，丢失 = 0 (0% 丢失)，
往返行程的估计时间(以毫秒为单位):
最短 = 38ms，最长 = 38ms，平均 = 38ms
Control-C
^C
C:\Users\smile>curl -I nsddd.top
HTTP/1.1 403 Forbidden
Server: nginx
Date: Sun, 24 Jul 2022 06:38:18 GMT
Content-Type: text/html; charset=UTF-8
Connection: keep-alive
Vary: Accept-Encoding
第一次失败，第二次成功
200ok
38 9.048950 192.168.139.29 110.42.175.115 HTTP 128 HEAD / HTTP/1.1
40 9.085921 110.42.175.115 192.168.139.29 HTTP 219 HTTP/1.1 403 Forbidden
字段
49 13.634746 192.168.139.29 110.42.175.115 HTTP 131 HEAD / HTTP/1.1
51 13.665263 110.42.175.115 192.168.139.29 HTTP 311 HTTP/1.1 200 OK
Frame 49: 131 bytes on wire (1048 bits), 131 bytes captured (1048 bits) on interface \Device\NPF_{17CC1A62-8145-46E6-9DB3-739B55186EEA}, id 0
Ethernet II, Src: 66:0d:c5:75:2c:44 (66:0d:c5:75:2c:44), Dst: 76:d6:83:47:29:43 (76:d6:83:47:29:43)
Internet Protocol Version 4, Src: 192.168.139.29, Dst: 110.42.175.115
Transmission Control Protocol, Src Port: 64501, Dst Port: 80, Seq: 1, Ack: 1, Len: 77
Source Port: 64501
Destination Port: 80
[Stream index: 3]
[Conversation completeness: Complete, WITH_DATA (31)]
[TCP Segment Len: 77]
Sequence Number: 1 (relative sequence number)
Sequence Number (raw): 2761004373
[Next Sequence Number: 78 (relative sequence number)]
Acknowledgment Number: 1 (relative ack number)
Acknowledgment number (raw): 3993791944
0101 .... = Header Length: 20 bytes (5)
Flags: 0x018 (PSH, ACK)
000. .... .... = Reserved: Not set
...0 .... .... = Nonce: Not set
.... 0... .... = Congestion Window Reduced (CWR): Not set
.... .0.. .... = ECN-Echo: Not set
.... ..0. .... = Urgent: Not set
.... ...1 .... = Acknowledgment: Set
.... .... 1... = Push: Set
.... .... .0.. = Reset: Not set
.... .... ..0. = Syn: Not set
.... .... ...0 = Fin: Not set
[TCP Flags: ·······AP···]
Window: 515
[Calculated window size: 131840]
[Window size scaling factor: 256]
Checksum: 0x69cb [unverified]
[Checksum Status: Unverified]
Urgent Pointer: 0
[Timestamps]
[Time since first frame in this TCP stream: 0.035362000 seconds]
[Time since previous frame in this TCP stream: 0.000294000 seconds]
[SEQ/ACK analysis]
[iRTT: 0.035068000 seconds]
[Bytes in flight: 77]
[Bytes sent since last PSH flag: 77]
TCP payload (77 bytes)
Hypertext Transfer Protocol
HEAD / HTTP/1.1\r\n
[Expert Info (Chat/Sequence): HEAD / HTTP/1.1\r\n]
[HEAD / HTTP/1.1\r\n]
[Severity level: Chat]
[Group: Sequence]
Request Method: HEAD
Request URI: /
Request Version: HTTP/1.1
Host: zt.nsddd.top\r\n
User-Agent: curl/7.83.1\r\n
Accept: */*\r\n
\r\n
[Full request URI: http://zt.nsddd.top/]
[HTTP request 1/1]
[Response in frame: 51]
Frame 51: 311 bytes on wire (2488 bits), 311 bytes captured (2488 bits) on interface \Device\NPF_{17CC1A62-8145-46E6-9DB3-739B55186EEA}, id 0
Ethernet II, Src: 76:d6:83:47:29:43 (76:d6:83:47:29:43), Dst: 66:0d:c5:75:2c:44 (66:0d:c5:75:2c:44)
Internet Protocol Version 4, Src: 110.42.175.115, Dst: 192.168.139.29
Transmission Control Protocol, Src Port: 80, Dst Port: 64501, Seq: 1, Ack: 78, Len: 257
Source Port: 80
Destination Port: 64501
[Stream index: 3]
[Conversation completeness: Complete, WITH_DATA (31)]
[TCP Segment Len: 257]
Sequence Number: 1 (relative sequence number)
Sequence Number (raw): 3993791944
[Next Sequence Number: 258 (relative sequence number)]
Acknowledgment Number: 78 (relative ack number)
Acknowledgment number (raw): 2761004450
0101 .... = Header Length: 20 bytes (5)
Flags: 0x018 (PSH, ACK)
000. .... .... = Reserved: Not set
...0 .... .... = Nonce: Not set
.... 0... .... = Congestion Window Reduced (CWR): Not set
.... .0.. .... = ECN-Echo: Not set
.... ..0. .... = Urgent: Not set
.... ...1 .... = Acknowledgment: Set
.... .... 1... = Push: Set
.... .... .0.. = Reset: Not set
.... .... ..0. = Syn: Not set
.... .... ...0 = Fin: Not set
[TCP Flags: ·······AP···]
Window: 229
[Calculated window size: 29312]
[Window size scaling factor: 128]
Checksum: 0x3278 [unverified]
[Checksum Status: Unverified]
Urgent Pointer: 0
[Timestamps]
[Time since first frame in this TCP stream: 0.065879000 seconds]
[Time since previous frame in this TCP stream: 0.000000000 seconds]
[SEQ/ACK analysis]
[iRTT: 0.035068000 seconds]
[Bytes in flight: 257]
[Bytes sent since last PSH flag: 257]
TCP payload (257 bytes)
Hypertext Transfer Protocol
HTTP/1.1 200 OK\r\n
[Expert Info (Chat/Sequence): HTTP/1.1 200 OK\r\n]
[HTTP/1.1 200 OK\r\n]
[Severity level: Chat]
[Group: Sequence]
Response Version: HTTP/1.1
Status Code: 200
[Status Code Description: OK]
Response Phrase: OK
Server: nginx\r\n
Date: Sun, 24 Jul 2022 06:39:44 GMT\r\n
Content-Type: text/html\r\n
Content-Length: 16902\r\n
Last-Modified: Thu, 05 May 2022 12:19:04 GMT\r\n
Connection: keep-alive\r\n
Vary: Accept-Encoding\r\n
ETag: "6273c0b8-4206"\r\n
Accept-Ranges: bytes\r\n
\r\n
[HTTP response 1/1]
[Time since request: 0.030517000 seconds]
[Request in frame: 49]
[Request URI: http://zt.nsddd.top/]