ThousandEyes の Web テストの User-Agent は公式ドキュメントが間違っている
ThousandEyes の Default User-Agent Strings によると HTTP Server Test の場合、User-Agent は User-Agent: curl/7.51.0-DEV だと記載されています。
ですが、実際にパケットをキャプチャすると下記になっています。
User-Agent: curl になっている (公式ドキュメントと異なる)X-ThousandEyes-Agent: yes も付与される
デフォルト User-Agent のキャプチャ結果
tshark で実際にキャプチャした出力例は以下の通りです。 User-Agent: curl 及び X-ThousandEyes-Agent: yes になっていることが分かります。
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111 | # tshark -i eth0 -n -V -Y "http.request"
Running as user "root" and group "root". This could be dangerous.
Capturing on 'eth0'
Frame 27: 292 bytes on wire (2336 bits), 292 bytes captured (2336 bits) on interface 0
Interface id: 0
Encapsulation type: Ethernet (1)
Arrival Time: Sep 2, 2022 05:45:51.296784160 UTC
[Time shift for this packet: 0.000000000 seconds]
Epoch Time: 1662097551.296784160 seconds
[Time delta from previous captured frame: 0.000056665 seconds]
[Time delta from previous displayed frame: 0.000000000 seconds]
[Time since reference or first frame: 98.193993688 seconds]
Frame Number: 27
Frame Length: 292 bytes (2336 bits)
Capture Length: 292 bytes (2336 bits)
[Frame is marked: False]
[Frame is ignored: False]
[Protocols in frame: eth:ip:tcp:http]
Ethernet II, Src: 06:c4:7f:0c:9d:3a (06:c4:7f:0c:9d:3a), Dst: 06:2d:db:37:c8:a3 (06:2d:db:37:c8:a3)
Destination: 06:2d:db:37:c8:a3 (06:2d:db:37:c8:a3)
Address: 06:2d:db:37:c8:a3 (06:2d:db:37:c8:a3)
.... ..1. .... .... .... .... = LG bit: Locally administered address (this is NOT the factory default)
.... ...0 .... .... .... .... = IG bit: Individual address (unicast)
Source: 06:c4:7f:0c:9d:3a (06:c4:7f:0c:9d:3a)
Address: 06:c4:7f:0c:9d:3a (06:c4:7f:0c:9d:3a)
.... ..1. .... .... .... .... = LG bit: Locally administered address (this is NOT the factory default)
.... ...0 .... .... .... .... = IG bit: Individual address (unicast)
Type: IP (0x0800)
Internet Protocol Version 4, Src: 23.248.164.42 (23.248.164.42), Dst: 192.168.224.16 (192.168.224.16)
Version: 4
Header length: 20 bytes
Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00: Not-ECT (Not ECN-Capable Transport))
0000 00.. = Differentiated Services Codepoint: Default (0x00)
.... ..00 = Explicit Congestion Notification: Not-ECT (Not ECN-Capable Transport) (0x00)
Total Length: 278
Identification: 0x8b7e (35710)
Flags: 0x02 (Don't Fragment)
0... .... = Reserved bit: Not set
.1.. .... = Don't fragment: Set
..0. .... = More fragments: Not set
Fragment offset: 0
Time to live: 42
Protocol: TCP (6)
Header checksum: 0x6788 [validation disabled]
[Good: False]
[Bad: False]
Source: 23.248.164.42 (23.248.164.42)
Destination: 192.168.224.16 (192.168.224.16)
Transmission Control Protocol, Src Port: 53264 (53264), Dst Port: 80 (80), Seq: 1, Ack: 1, Len: 226
Source port: 53264 (53264)
Destination port: 80 (80)
[Stream index: 0]
Sequence number: 1 (relative sequence number)
[Next sequence number: 227 (relative sequence number)]
Acknowledgment number: 1 (relative ack number)
Header length: 32 bytes
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
Window size value: 502
[Calculated window size: 64256]
[Window size scaling factor: 128]
Checksum: 0xb38d [validation disabled]
[Good Checksum: False]
[Bad Checksum: False]
Options: (12 bytes), No-Operation (NOP), No-Operation (NOP), Timestamps
No-Operation (NOP)
Type: 1
0... .... = Copy on fragmentation: No
.00. .... = Class: Control (0)
...0 0001 = Number: No-Operation (NOP) (1)
No-Operation (NOP)
Type: 1
0... .... = Copy on fragmentation: No
.00. .... = Class: Control (0)
...0 0001 = Number: No-Operation (NOP) (1)
Timestamps: TSval 1657494759, TSecr 3271439425
Kind: Timestamp (8)
Length: 10
Timestamp value: 1657494759
Timestamp echo reply: 3271439425
[SEQ/ACK analysis]
[Bytes in flight: 226]
Hypertext Transfer Protocol
GET / HTTP/1.1\r\n
[Expert Info (Chat/Sequence): GET / HTTP/1.1\r\n]
[Message: GET / HTTP/1.1\r\n]
[Severity level: Chat]
[Group: Sequence]
Request Method: GET
Request URI: /
Request Version: HTTP/1.1
Host: www.example.com\r\n
User-Agent: curl\r\n
Accept: */*\r\n
Accept-Encoding: deflate, gzip\r\n
Connection: Upgrade, HTTP2-Settings\r\n
Upgrade: h2c\r\n
HTTP2-Settings: AAMAAABkAARAAAAAAAIAAAAA\r\n
X-ThousandEyes-Agent: yes\r\n
\r\n
[Full request URI: http://www.example.com/]
[HTTP request 1/1]
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カスタム User-Agent のキャプチャ結果
User-Agent をカスタマイズする場合は Custom User-Agent Strings in a Web Test の手順に従います。 今回は以下のように CUSTOM-USER-AGENT と設定しました。
これをキャプチャした結果は以下の通りです。
User-Agent: CUSTOM-USER-AGENT に変更されているX-ThousandEyes-Agent: yes も付与される
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111 | # tshark -i eth0 -n -V -Y "http.request"
Running as user "root" and group "root". This could be dangerous.
Capturing on 'eth0'
Frame 38: 305 bytes on wire (2440 bits), 305 bytes captured (2440 bits) on interface 0
Interface id: 0
Encapsulation type: Ethernet (1)
Arrival Time: Sep 2, 2022 13:35:02.650728079 UTC
[Time shift for this packet: 0.000000000 seconds]
Epoch Time: 1662125702.650728079 seconds
[Time delta from previous captured frame: 0.000039499 seconds]
[Time delta from previous displayed frame: 0.000000000 seconds]
[Time since reference or first frame: 150.788132120 seconds]
Frame Number: 38
Frame Length: 305 bytes (2440 bits)
Capture Length: 305 bytes (2440 bits)
[Frame is marked: False]
[Frame is ignored: False]
[Protocols in frame: eth:ip:tcp:http]
Ethernet II, Src: 06:c4:7f:0c:9d:3a (06:c4:7f:0c:9d:3a), Dst: 06:2d:db:37:c8:a3 (06:2d:db:37:c8:a3)
Destination: 06:2d:db:37:c8:a3 (06:2d:db:37:c8:a3)
Address: 06:2d:db:37:c8:a3 (06:2d:db:37:c8:a3)
.... ..1. .... .... .... .... = LG bit: Locally administered address (this is NOT the factory default)
.... ...0 .... .... .... .... = IG bit: Individual address (unicast)
Source: 06:c4:7f:0c:9d:3a (06:c4:7f:0c:9d:3a)
Address: 06:c4:7f:0c:9d:3a (06:c4:7f:0c:9d:3a)
.... ..1. .... .... .... .... = LG bit: Locally administered address (this is NOT the factory default)
.... ...0 .... .... .... .... = IG bit: Individual address (unicast)
Type: IP (0x0800)
Internet Protocol Version 4, Src: 23.248.164.42 (23.248.164.42), Dst: 192.168.224.16 (192.168.224.16)
Version: 4
Header length: 20 bytes
Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00: Not-ECT (Not ECN-Capable Transport))
0000 00.. = Differentiated Services Codepoint: Default (0x00)
.... ..00 = Explicit Congestion Notification: Not-ECT (Not ECN-Capable Transport) (0x00)
Total Length: 291
Identification: 0xc6aa (50858)
Flags: 0x02 (Don't Fragment)
0... .... = Reserved bit: Not set
.1.. .... = Don't fragment: Set
..0. .... = More fragments: Not set
Fragment offset: 0
Time to live: 42
Protocol: TCP (6)
Header checksum: 0x2c4f [validation disabled]
[Good: False]
[Bad: False]
Source: 23.248.164.42 (23.248.164.42)
Destination: 192.168.224.16 (192.168.224.16)
Transmission Control Protocol, Src Port: 35316 (35316), Dst Port: 80 (80), Seq: 1, Ack: 1, Len: 239
Source port: 35316 (35316)
Destination port: 80 (80)
[Stream index: 0]
Sequence number: 1 (relative sequence number)
[Next sequence number: 240 (relative sequence number)]
Acknowledgment number: 1 (relative ack number)
Header length: 32 bytes
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
Window size value: 502
[Calculated window size: 64256]
[Window size scaling factor: 128]
Checksum: 0xb668 [validation disabled]
[Good Checksum: False]
[Bad Checksum: False]
Options: (12 bytes), No-Operation (NOP), No-Operation (NOP), Timestamps
No-Operation (NOP)
Type: 1
0... .... = Copy on fragmentation: No
.00. .... = Class: Control (0)
...0 0001 = Number: No-Operation (NOP) (1)
No-Operation (NOP)
Type: 1
0... .... = Copy on fragmentation: No
.00. .... = Class: Control (0)
...0 0001 = Number: No-Operation (NOP) (1)
Timestamps: TSval 1685646112, TSecr 3299590778
Kind: Timestamp (8)
Length: 10
Timestamp value: 1685646112
Timestamp echo reply: 3299590778
[SEQ/ACK analysis]
[Bytes in flight: 239]
Hypertext Transfer Protocol
GET / HTTP/1.1\r\n
[Expert Info (Chat/Sequence): GET / HTTP/1.1\r\n]
[Message: GET / HTTP/1.1\r\n]
[Severity level: Chat]
[Group: Sequence]
Request Method: GET
Request URI: /
Request Version: HTTP/1.1
Host: www.example.com\r\n
User-Agent: CUSTOM-USER-AGENT\r\n
Accept: */*\r\n
Accept-Encoding: deflate, gzip\r\n
Connection: Upgrade, HTTP2-Settings\r\n
Upgrade: h2c\r\n
HTTP2-Settings: AAMAAABkAARAAAAAAAIAAAAA\r\n
X-ThousandEyes-Agent: yes\r\n
\r\n
[Full request URI: http://www.example.com/]
[HTTP request 1/1]
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