unable to recieve api request when using flask api endpoint for content length 0

[NutroUzumaki]

@app.route("/", methods=["GET", "POST"])
def test():
print("Received POST request")
xml_data = request.data.decode("utf-8")
return xml_data

Frame 449: 217 bytes on wire (1736 bits), 217 bytes captured (1736 bits) on interface \Device\NPF_{0C348CD8-FCF8-4F74-A5C2-71025925AE64}, id 0
Section number: 1
Interface id: 0 (\Device\NPF_{0C348CD8-FCF8-4F74-A5C2-71025925AE64})
Interface name: \Device\NPF_{0C348CD8-FCF8-4F74-A5C2-71025925AE64}
Interface description: Wi-Fi
Encapsulation type: Ethernet (1)
Arrival Time: Aug 6, 2024 11:59:58.775401000 India Standard Time
UTC Arrival Time: Aug 6, 2024 06:29:58.775401000 UTC
Epoch Arrival Time: 1722925798.775401000
[Time shift for this packet: 0.000000000 seconds]
[Time delta from previous captured frame: 0.001284000 seconds]
[Time delta from previous displayed frame: 0.002276000 seconds]
[Time since reference or first frame: 26.993950000 seconds]
Frame Number: 449
Frame Length: 217 bytes (1736 bits)
Capture Length: 217 bytes (1736 bits)
[Frame is marked: False]
[Frame is ignored: False]
[Protocols in frame: eth:ethertype:ip:tcp:http]
[Coloring Rule Name: HTTP]
[Coloring Rule String: http || tcp.port == 80 || http2]
Ethernet II, Src: TPLink_80:b2:27 (30:de:4b:80:b2:27), Dst: Intel_d5:d1:a3 (24:41:8c:d5:d1:a3)
Destination: Intel_d5:d1:a3 (24:41:8c:d5:d1:a3)
Address: Intel_d5:d1:a3 (24:41:8c:d5:d1:a3)
.... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
.... ...0 .... .... .... .... = IG bit: Individual address (unicast)
Source: TPLink_80:b2:27 (30:de:4b:80:b2:27)
Address: TPLink_80:b2:27 (30:de:4b:80:b2:27)
.... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
.... ...0 .... .... .... .... = IG bit: Individual address (unicast)
Type: IPv4 (0x0800)
Internet Protocol Version 4, Src: 192.168.0.1, Dst: 192.168.0.112
0100 .... = Version: 4
.... 0101 = Header Length: 20 bytes (5)
Differentiated Services Field: 0x00 (DSCP: CS0, ECN: Not-ECT)
0000 00.. = Differentiated Services Codepoint: Default (0)
.... ..00 = Explicit Congestion Notification: Not ECN-Capable Transport (0)
Total Length: 203
Identification: 0x842d (33837)
010. .... = Flags: 0x2, Don't fragment
0... .... = Reserved bit: Not set
.1.. .... = Don't fragment: Set
..0. .... = More fragments: Not set
...0 0000 0000 0000 = Fragment Offset: 0
Time to Live: 64
Protocol: TCP (6)
Header Checksum: 0x343e [validation disabled]
[Header checksum status: Unverified]
Source Address: 192.168.0.1
Destination Address: 192.168.0.112
Transmission Control Protocol, Src Port: 55678, Dst Port: 7547, Seq: 2654, Ack: 963, Len: 151
Source Port: 55678
Destination Port: 7547
[Stream index: 15]
[Conversation completeness: Complete, WITH_DATA (31)]
..0. .... = RST: Absent
...1 .... = FIN: Present
.... 1... = Data: Present
.... .1.. = ACK: Present
.... ..1. = SYN-ACK: Present
.... ...1 = SYN: Present
[Completeness Flags: ·FDASS]
[TCP Segment Len: 151]
Sequence Number: 2654 (relative sequence number)
Sequence Number (raw): 1783102832
[Next Sequence Number: 2805 (relative sequence number)]
Acknowledgment Number: 963 (relative ack number)
Acknowledgment number (raw): 1513550442
1000 .... = Header Length: 32 bytes (8)
Flags: 0x018 (PSH, ACK)
000. .... .... = Reserved: Not set
...0 .... .... = Accurate ECN: Not set
.... 0... .... = Congestion Window Reduced: 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: 3709
[Calculated window size: 7418]
[Window size scaling factor: 2]
Checksum: 0xf53f [unverified]
[Checksum Status: Unverified]
Urgent Pointer: 0
Options: (12 bytes), No-Operation (NOP), No-Operation (NOP), Timestamps
TCP Option - No-Operation (NOP)
Kind: No-Operation (1)
TCP Option - No-Operation (NOP)
Kind: No-Operation (1)
TCP Option - Timestamps: TSval 17070944, TSecr 265118408
Kind: Time Stamp Option (8)
Length: 10
Timestamp value: 17070944
Timestamp echo reply: 265118408
[Timestamps]
[Time since first frame in this TCP stream: 4.272772000 seconds]
[Time since previous frame in this TCP stream: 0.001284000 seconds]
[SEQ/ACK analysis]
[iRTT: 0.001355000 seconds]
[Bytes in flight: 151]
[Bytes sent since last PSH flag: 151]
TCP payload (151 bytes)
Hypertext Transfer Protocol
POST / HTTP/1.1\r\n
[Expert Info (Chat/Sequence): POST / HTTP/1.1\r\n]
[POST / HTTP/1.1\r\n]
[Severity level: Chat]
[Group: Sequence]
Request Method: POST
Request URI: /
Request Version: HTTP/1.1
Host: 192.168.0.112\r\n
User-Agent: TR069_AGENT/1.0\r\n
Content-Length: 0\r\n
[Content length: 0]
Connection: keep-alive\r\n
Content-Type: text/xml; charset=utf-8\r\n
\r\n
[Full request URI: http://192.168.0.112/]
[HTTP request 2/2]
[Prev request in frame: 369]

this above is a full packet which was displayed in wireshark
but this request never reached my api