diff --git a/doc/protocol.md b/doc/protocol.md
index a2cf4d5..a01a6c9 100644
--- a/doc/protocol.md
+++ b/doc/protocol.md
@@ -105,12 +105,10 @@ A algo hash bloc contains:
 ### Tracker specific messages
 #### Register
 Used by a server to register itself on a tracker.
-Payload contains `0x01` if working on udp, `0x02` if working on tcp, `0x03` if working on both.
 Server may want to do a free `DISCOVER` to check if they have been registered.
 
 #### Unregister
 Used by a server to unregister itself from a tracker.
-Payload contains `0x01` if unregister from udp, `0x02` if unregister from tcp, `0x03` if unregister on both.
 No error is raised if the server was not registered.
 Server may want to do a free `DISCOVER` to check if they have been unregistered.
 
@@ -135,7 +133,6 @@ Server block is composed with:
 
 ```
 2 bytes: [port]
-1 byte: [protocols (udp: 0x01, tcp: 0x02, tcp+udp: 0x03)]
 ? bytes: hostname
 \n
 ```
diff --git a/doc/tracker_sequence_diagram.drawio b/doc/tracker_sequence_diagram.drawio
index baa61f9..85919a8 100644
--- a/doc/tracker_sequence_diagram.drawio
+++ b/doc/tracker_sequence_diagram.drawio
@@ -1 +1 @@
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diff --git a/doc/tracker_sequence_diagram.svg b/doc/tracker_sequence_diagram.svg
index ee79363..7018a9a 100644
--- a/doc/tracker_sequence_diagram.svg
+++ b/doc/tracker_sequence_diagram.svg
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text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe flex-end; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 207px; margin-left: 130px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 11px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; background-color: #ffffff; white-space: nowrap; ">LIST RESP(file1, file2)</div></div></div></foreignObject><text x="130" y="207" fill="#000000" font-family="Helvetica" font-size="11px" text-anchor="middle">LIST RESP(f...</text></switch></g><path d="M 193.5 400 L 240 400 Q 250 400 260 400 L 341.38 400" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="stroke"/><ellipse cx="189.5" cy="400" rx="4" ry="4" fill="#000000" stroke="#000000" pointer-events="all"/><path d="M 348.38 400 L 341.38 403.5 L 341.38 396.5 Z" fill="#000000" stroke="#000000" stroke-miterlimit="10" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe flex-end; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 397px; margin-left: 270px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 11px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; background-color: #ffffff; white-space: nowrap; ">DISCOVER RESP(server1-udp-tcp, server2-udp-tcp, server3-udp-tcp)</div></div></div></foreignObject><text x="270" y="397" fill="#000000" font-family="Helvetica" font-size="11px" text-anchor="middle">DISCOVER RE...</text></switch></g><rect x="450" y="50" width="100" height="40" rx="6" ry="6" fill="#ffffff" stroke="#000000" pointer-events="all"/><path d="M 500 90 L 500 630" fill="none" stroke="#000000" stroke-miterlimit="10" stroke-dasharray="3 3" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 98px; height: 1px; padding-top: 70px; margin-left: 451px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 12px; font-family: Verdana; color: #000000; line-height: 1.2; pointer-events: all; white-space: normal; word-wrap: normal; ">Server2</div></div></div></foreignObject><text x="500" y="74" fill="#000000" font-family="Verdana" font-size="12px" text-anchor="middle">Server2</text></switch></g><path d="M 496 130 L 197.62 130" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="stroke"/><ellipse cx="500" cy="130" rx="4" ry="4" fill="#000000" stroke="#000000" pointer-events="all"/><path d="M 190.62 130 L 197.62 126.5 L 197.62 133.5 Z" fill="#000000" stroke="#000000" stroke-miterlimit="10" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe flex-end; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 127px; margin-left: 345px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 11px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; background-color: #ffffff; white-space: nowrap; ">REGISTER(udp+tcp)</div></div></div></foreignObject><text x="345" y="127" fill="#000000" font-family="Helvetica" font-size="11px" text-anchor="middle">REGISTER(ud...</text></switch></g><path d="M 194 230 L 491.38 230" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="stroke"/><ellipse cx="190" cy="230" rx="4" ry="4" fill="#000000" stroke="#000000" pointer-events="all"/><path d="M 498.38 230 L 491.38 233.5 L 491.38 226.5 Z" fill="#000000" stroke="#000000" stroke-miterlimit="10" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe flex-end; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 227px; margin-left: 345px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 11px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; background-color: #ffffff; white-space: nowrap; ">LIST REQ</div></div></div></foreignObject><text x="345" y="227" fill="#000000" font-family="Helvetica" font-size="11px" text-anchor="middle">LIST REQ</text></switch></g><path d="M 345.5 340 L 330 340 Q 320 340 310 340 L 280 340 Q 270 340 260 340 L 197.62 340" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="stroke"/><ellipse cx="349.5" cy="340" rx="4" ry="4" fill="#000000" stroke="#000000" pointer-events="all"/><path d="M 190.62 340 L 197.62 336.5 L 197.62 343.5 Z" fill="#000000" stroke="#000000" stroke-miterlimit="10" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe flex-end; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 337px; margin-left: 270px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 11px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; background-color: #ffffff; white-space: nowrap; "><div>DISCOVER REQ()</div></div></div></div></foreignObject><text x="270" y="337" fill="#000000" font-family="Helvetica" font-size="11px" text-anchor="middle">DISCOVER RE...</text></switch></g><path d="M 495.5 290 L 470 290 Q 460 290 450 290 L 340 290 Q 330 290 320 290 L 197.62 290" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="stroke"/><ellipse cx="499.5" cy="290" rx="4" ry="4" fill="#000000" stroke="#000000" pointer-events="all"/><path d="M 190.62 290 L 197.62 286.5 L 197.62 293.5 Z" fill="#000000" stroke="#000000" stroke-miterlimit="10" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe flex-end; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 287px; margin-left: 345px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 11px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; background-color: #ffffff; white-space: nowrap; ">LIST RESP(file2, file3)</div></div></div></foreignObject><text x="345" y="287" fill="#000000" font-family="Helvetica" font-size="11px" text-anchor="middle">LIST RESP(f...</text></switch></g><path d="M 336 460 L 57.62 460" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="stroke"/><ellipse cx="340" cy="460" rx="4" ry="4" fill="#000000" stroke="#000000" pointer-events="all"/><path d="M 50.62 460 L 57.62 456.5 L 57.62 463.5 Z" fill="#000000" stroke="#000000" stroke-miterlimit="10" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe flex-end; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 457px; margin-left: 200px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 11px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; background-color: #ffffff; white-space: nowrap; ">LIST REQ</div></div></div></foreignObject><text x="200" y="457" fill="#000000" font-family="Helvetica" font-size="11px" text-anchor="middle">LIST REQ</text></switch></g><rect x="570" y="50" width="100" height="40" rx="6" ry="6" fill="#ffffff" stroke="#000000" pointer-events="all"/><path d="M 620 90 L 620 630" fill="none" stroke="#000000" stroke-miterlimit="10" stroke-dasharray="3 3" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 98px; height: 1px; padding-top: 70px; margin-left: 571px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 12px; font-family: Verdana; color: #000000; line-height: 1.2; pointer-events: all; white-space: normal; word-wrap: normal; ">Server3</div></div></div></foreignObject><text x="620" y="74" fill="#000000" font-family="Verdana" font-size="12px" text-anchor="middle">Server3</text></switch></g><path d="M 615.5 160 L 550 160 Q 540 160 530 160 L 197.62 160" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="stroke"/><ellipse cx="619.5" cy="160" rx="4" ry="4" fill="#000000" stroke="#000000" pointer-events="all"/><path d="M 190.62 160 L 197.62 156.5 L 197.62 163.5 Z" fill="#000000" stroke="#000000" stroke-miterlimit="10" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe flex-end; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 157px; margin-left: 405px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 11px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; background-color: #ffffff; white-space: nowrap; ">REGISTER(udp+tcp)</div></div></div></foreignObject><text x="405" y="157" fill="#000000" font-family="Helvetica" font-size="11px" text-anchor="middle">REGISTER(ud...</text></switch></g><path d="M 194 190 L 611.38 190" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="stroke"/><ellipse cx="190" cy="190" rx="4" ry="4" fill="#000000" stroke="#000000" pointer-events="all"/><path d="M 618.38 190 L 611.38 193.5 L 611.38 186.5 Z" fill="#000000" stroke="#000000" stroke-miterlimit="10" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe flex-end; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 187px; margin-left: 405px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 11px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; background-color: #ffffff; white-space: nowrap; ">LIST REQ</div></div></div></foreignObject><text x="405" y="187" fill="#000000" font-family="Helvetica" font-size="11px" text-anchor="middle">LIST REQ</text></switch></g><path d="M 615.5 310 L 440 310 Q 430 310 420 310 L 290 310 Q 280 310 270 310 L 197.62 310" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="stroke"/><ellipse cx="619.5" cy="310" rx="4" ry="4" fill="#000000" stroke="#000000" pointer-events="all"/><path d="M 190.62 310 L 197.62 306.5 L 197.62 313.5 Z" fill="#000000" stroke="#000000" stroke-miterlimit="10" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe flex-end; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 307px; margin-left: 405px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 11px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; background-color: #ffffff; white-space: nowrap; ">LIST RESP(file1, file3)</div></div></div></foreignObject><text x="405" y="307" fill="#000000" font-family="Helvetica" font-size="11px" text-anchor="middle">LIST RESP(f...</text></switch></g><path d="M 53.5 550 L 100 550 Q 110 550 120 550 L 160 550 Q 170 550 180 550 L 341.38 550" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="stroke"/><ellipse cx="49.5" cy="550" rx="4" ry="4" fill="#000000" stroke="#000000" pointer-events="all"/><path d="M 348.38 550 L 341.38 553.5 L 341.38 546.5 Z" fill="#000000" stroke="#000000" stroke-miterlimit="10" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe flex-end; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 537px; margin-left: 201px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 11px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; background-color: #ffffff; white-space: nowrap; ">LIST RESP(file2, file2)</div></div></div></foreignObject><text x="201" y="537" fill="#000000" font-family="Helvetica" font-size="11px" text-anchor="middle">LIST RESP(f...</text></switch></g><path d="M 345.5 590 L 230 590 Q 220 590 210 590 L 197.62 590" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="stroke"/><ellipse cx="349.5" cy="590" rx="4" ry="4" fill="#000000" stroke="#000000" pointer-events="all"/><path d="M 190.62 590 L 197.62 586.5 L 197.62 593.5 Z" fill="#000000" stroke="#000000" stroke-miterlimit="10" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe flex-end; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 587px; margin-left: 270px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 11px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; background-color: #ffffff; white-space: nowrap; ">DISCOVER REQ(fichier2)</div></div></div></foreignObject><text x="270" y="587" fill="#000000" font-family="Helvetica" font-size="11px" text-anchor="middle">DISCOVER RE...</text></switch></g><path d="M 70 650 L 676 650 L 690 664 L 690 720 L 70 720 L 70 650 Z" fill="#ffffff" stroke="#000000" stroke-miterlimit="10" pointer-events="all"/><path d="M 676 650 L 676 664 L 690 664" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe flex-start; justify-content: unsafe flex-start; width: 618px; height: 1px; padding-top: 651px; margin-left: 72px;"><div style="box-sizing: border-box; font-size: 0; text-align: left; "><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; white-space: normal; word-wrap: normal; ">Now the client knows server1 and server3 have file1: download can begin.</div></div></div></foreignObject><text x="72" y="663" fill="#000000" font-family="Helvetica" font-size="12px">Now the client knows server1 and server3 have file1: download can begin.</text></switch></g><path d="M 193.5 630 L 330 630 Q 340 630 340.69 630 L 341.38 630" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="stroke"/><ellipse cx="189.5" cy="630" rx="4" ry="4" fill="#000000" stroke="#000000" pointer-events="all"/><path d="M 348.38 630 L 341.38 633.5 L 341.38 626.5 Z" fill="#000000" stroke="#000000" stroke-miterlimit="10" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; 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text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe flex-end; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 287px; margin-left: 345px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 11px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; background-color: #ffffff; white-space: nowrap; ">LIST RESP(file2, file3)</div></div></div></foreignObject><text x="345" y="287" fill="#000000" font-family="Helvetica" font-size="11px" text-anchor="middle">LIST RESP(f...</text></switch></g><path d="M 336 460 L 57.62 460" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="stroke"/><ellipse cx="340" cy="460" rx="4" ry="4" fill="#000000" stroke="#000000" pointer-events="all"/><path d="M 50.62 460 L 57.62 456.5 L 57.62 463.5 Z" fill="#000000" stroke="#000000" stroke-miterlimit="10" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe flex-end; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 457px; margin-left: 200px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 11px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; background-color: #ffffff; white-space: nowrap; ">LIST REQ</div></div></div></foreignObject><text x="200" y="457" fill="#000000" font-family="Helvetica" font-size="11px" text-anchor="middle">LIST REQ</text></switch></g><rect x="570" y="50" width="100" height="40" rx="6" ry="6" fill="#ffffff" stroke="#000000" pointer-events="all"/><path d="M 620 90 L 620 630" fill="none" stroke="#000000" stroke-miterlimit="10" stroke-dasharray="3 3" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 98px; height: 1px; padding-top: 70px; margin-left: 571px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 12px; font-family: Verdana; color: #000000; line-height: 1.2; pointer-events: all; white-space: normal; word-wrap: normal; ">Server3</div></div></div></foreignObject><text x="620" y="74" fill="#000000" font-family="Verdana" font-size="12px" text-anchor="middle">Server3</text></switch></g><path d="M 615.5 160 L 550 160 Q 540 160 530 160 L 197.62 160" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="stroke"/><ellipse cx="619.5" cy="160" rx="4" ry="4" fill="#000000" stroke="#000000" pointer-events="all"/><path d="M 190.62 160 L 197.62 156.5 L 197.62 163.5 Z" fill="#000000" stroke="#000000" stroke-miterlimit="10" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe flex-end; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 157px; margin-left: 405px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 11px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; background-color: #ffffff; white-space: nowrap; ">REGISTER()</div></div></div></foreignObject><text x="405" y="157" fill="#000000" font-family="Helvetica" font-size="11px" text-anchor="middle">REGISTER()</text></switch></g><path d="M 194 190 L 611.38 190" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="stroke"/><ellipse cx="190" cy="190" rx="4" ry="4" fill="#000000" stroke="#000000" pointer-events="all"/><path d="M 618.38 190 L 611.38 193.5 L 611.38 186.5 Z" fill="#000000" stroke="#000000" stroke-miterlimit="10" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe flex-end; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 187px; margin-left: 405px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 11px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; background-color: #ffffff; white-space: nowrap; ">LIST REQ</div></div></div></foreignObject><text x="405" y="187" fill="#000000" font-family="Helvetica" font-size="11px" text-anchor="middle">LIST REQ</text></switch></g><path d="M 615.5 310 L 440 310 Q 430 310 420 310 L 290 310 Q 280 310 270 310 L 197.62 310" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="stroke"/><ellipse cx="619.5" cy="310" rx="4" ry="4" fill="#000000" stroke="#000000" pointer-events="all"/><path d="M 190.62 310 L 197.62 306.5 L 197.62 313.5 Z" fill="#000000" stroke="#000000" stroke-miterlimit="10" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe flex-end; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 307px; margin-left: 405px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 11px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; background-color: #ffffff; white-space: nowrap; ">LIST RESP(file1, file3)</div></div></div></foreignObject><text x="405" y="307" fill="#000000" font-family="Helvetica" font-size="11px" text-anchor="middle">LIST RESP(f...</text></switch></g><path d="M 53.5 550 L 100 550 Q 110 550 120 550 L 160 550 Q 170 550 180 550 L 341.38 550" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="stroke"/><ellipse cx="49.5" cy="550" rx="4" ry="4" fill="#000000" stroke="#000000" pointer-events="all"/><path d="M 348.38 550 L 341.38 553.5 L 341.38 546.5 Z" fill="#000000" stroke="#000000" stroke-miterlimit="10" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe flex-end; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 537px; margin-left: 201px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 11px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; background-color: #ffffff; white-space: nowrap; ">LIST RESP(file2, file2)</div></div></div></foreignObject><text x="201" y="537" fill="#000000" font-family="Helvetica" font-size="11px" text-anchor="middle">LIST RESP(f...</text></switch></g><path d="M 345.5 590 L 230 590 Q 220 590 210 590 L 197.62 590" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="stroke"/><ellipse cx="349.5" cy="590" rx="4" ry="4" fill="#000000" stroke="#000000" pointer-events="all"/><path d="M 190.62 590 L 197.62 586.5 L 197.62 593.5 Z" fill="#000000" stroke="#000000" stroke-miterlimit="10" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe flex-end; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 587px; margin-left: 270px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 11px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; background-color: #ffffff; white-space: nowrap; ">DISCOVER REQ(fichier2)</div></div></div></foreignObject><text x="270" y="587" fill="#000000" font-family="Helvetica" font-size="11px" text-anchor="middle">DISCOVER RE...</text></switch></g><path d="M 70 650 L 676 650 L 690 664 L 690 720 L 70 720 L 70 650 Z" fill="#ffffff" stroke="#000000" stroke-miterlimit="10" pointer-events="all"/><path d="M 676 650 L 676 664 L 690 664" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe flex-start; justify-content: unsafe flex-start; width: 618px; height: 1px; padding-top: 651px; margin-left: 72px;"><div style="box-sizing: border-box; font-size: 0; text-align: left; "><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; white-space: normal; word-wrap: normal; ">Now the client knows server1 and server3 have file1: download can begin.</div></div></div></foreignObject><text x="72" y="663" fill="#000000" font-family="Helvetica" font-size="12px">Now the client knows server1 and server3 have file1: download can begin.</text></switch></g><path d="M 193.5 630 L 330 630 Q 340 630 340.69 630 L 341.38 630" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="stroke"/><ellipse cx="189.5" cy="630" rx="4" ry="4" fill="#000000" stroke="#000000" pointer-events="all"/><path d="M 348.38 630 L 341.38 633.5 L 341.38 626.5 Z" fill="#000000" stroke="#000000" stroke-miterlimit="10" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe flex-end; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 627px; margin-left: 270px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 11px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; background-color: #ffffff; white-space: nowrap; ">DISCOVER RESP(server1, server3)</div></div></div></foreignObject><text x="270" y="627" fill="#000000" font-family="Helvetica" font-size="11px" text-anchor="middle">DISCOVER RE...</text></switch></g></g><switch><g requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"/><a transform="translate(0,-5)" xlink:href="https://desk.draw.io/support/solutions/articles/16000042487" target="_blank"><text text-anchor="middle" font-size="10px" x="50%" y="100%">Viewer does not support full SVG 1.1</text></a></switch></svg>
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