BG96 cannot set multipart/form-data boundary

I am trying to post a file in BG96 with multipart/form-data set.
But boundary is not set.

【Packets captured by the server】
ÿ|X\ºq[E£?@}UÑdJà^dJöOmäP’ Ëù,PPOST /api/XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Accept: /
Host: xxxxxx
User-Agent: QUECTEL_MODULE
Max-Forwards: 10
x-xxxxxxx-imsi: 9999999999999999
X-ARR-LOG-ID: 4af9b129-1ec0-4d3a-b677-4f1b7a32e988
CLIENT-IP: xxx.xx.xx.xxxxxx
WegmSECURITYTOKEN:zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
DISGUISED-HOST: xxxxxx.xxxxxx.xxxxxx
X-SITE-DEPLOYMENT-ID: xxxxxx
WAS-DEFAULT-HOSTNAME: xxxxxx.xxxxxx.xxxxx
X-Forwarded-Proto: https
X-AppService-Proto: https
X-ARR-SSL: 2048|256|CN=Microsoft Azure TLS Issuing CA 01, O=Microsoft Corporation, C=US|CN=*.azurewebsites.net, O=Microsoft Corporation, L=Redmond, S=WA, C=US
X-Forwarded-TlsVersion: 1.2
X-Forwarded-For: xxx.xx.xxx.xx:xxxxxx
X-Original-URL: /api/XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
X-WAWS-Unencoded-URL: /api/XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Content-Type: multipart/form-data
Content-Length: 225355

【Commands executed】

[2022-04-28 23:29:59:373_S:] at
[2022-04-28 23:29:59:438_R:] at
[2022-04-28 23:29:59:438_R:] OK
[2022-04-28 23:30:02:969_S:] AT+CMEE=2
[2022-04-28 23:30:03:034_R:] AT+CMEE=2
[2022-04-28 23:30:03:034_R:] OK
[2022-04-28 23:30:07:602_S:] AT+QURCCFG="URCPORT","uart1"
[2022-04-28 23:30:07:682_R:] AT+QURCCFG="URCPORT","uart1"
[2022-04-28 23:30:07:682_R:] OK
[2022-04-28 23:30:22:096_S:] AT+QICSGP=1,1,"xxxxxxxxxx","xxxx","xxxx",3
[2022-04-28 23:30:22:163_R:] AT+QICSGP=1,1,"xxxxxxxxxx","xxxx","xxxx",3
[2022-04-28 23:30:22:163_R:] OK
[2022-04-28 23:30:27:016_S:] AT+QIACT=1
[2022-04-28 23:30:27:080_R:] AT+QIACT=1
[2022-04-28 23:30:27:690_R:] OK
[2022-04-28 23:30:28:876_S:] AT+QIACT?
[2022-04-28 23:30:28:955_R:] AT+QIACT?
[2022-04-28 23:30:28:955_R:] +QIACT: 1,1,1,"10.191.6.17"

[2022-04-28 23:30:28:955_R:] OK
[2022-04-28 23:30:39:295_S:] AT+QHTTPCFG="contextid",1
[2022-04-28 23:30:39:362_R:] AT+QHTTPCFG="contextid",1
[2022-04-28 23:30:39:362_R:] OK
[2022-04-28 23:30:44:070_S:] AT+QHTTPCFG="contenttype",3
[2022-04-28 23:30:44:137_R:] AT+QHTTPCFG="contenttype",3
[2022-04-28 23:30:44:137_R:] OK
[2022-04-28 23:30:49:492_S:] AT+QHTTPCFG="requestheader",0
[2022-04-28 23:30:49:562_R:] AT+QHTTPCFG="requestheader",0
[2022-04-28 23:30:49:562_R:] OK
[2022-04-28 23:30:51:563_S:] AT+QHTTPCFG="responseheader",1
[2022-04-28 23:30:51:629_R:] AT+QHTTPCFG="responseheader",1
[2022-04-28 23:30:51:629_R:] OK
[2022-04-28 23:30:54:017_S:] AT+QHTTPURL=28,80

[2022-04-28 23:30:54:023_R:] DSR:0 CTS:1 RI:0 (DCD:1)
[2022-04-28 23:30:54:081_R:] AT+QHTTPURL=28,80
[2022-04-28 23:30:54:081_R:] CONNECT
[2022-04-28 23:30:55:697_S:] http://xxxxxx.xxxxxxx.xxx:9999/

[2022-04-28 23:30:55:704_R:] DSR:0 CTS:1 RI:0 (DCD:0)

[2022-04-28 23:30:55:761_R:] OK
[2022-04-28 23:31:22:225_S:] AT+QHTTPPOSTFILE="image01.jpg",60
[2022-04-28 23:31:22:292_R:] AT+QHTTPPOSTFILE="image01.jpg",60
[2022-04-28 23:31:22:292_R:] OK

[2022-04-28 23:31:31:061_R:] DSR:0 CTS:1 (RI:1) DCD:0

[2022-04-28 23:31:31:124_R:] +QHTTPPOSTFILE: 0,400

[2022-04-28 23:31:31:186_R:] DSR:0 CTS:1 (RI:0) DCD:0

Can anyone please help?
Thanks a lot in advice.

It’s not a BG96 problem. There was a misconfiguration in the server that relays the data.