How to send a request with Content-Type in application/octet-stream format?

send a request to oppo with the following headers

POST /client/get_search_completion.pb HTTP/1.1
brand: samsung
rom: 2
desktop: desktop_other
locale: zh_CN
uid: oppo.uid.nearme
Referer: SM-G955N/appstore/4.3.1/354730010542250
User-Agent: SM-G955N/4.4.2/Market/4.3.1
Connection: Keep-Alive
Ext-System: SM-G955N/4.4.2/0/2/2/4.3.1/20
Ext-User: -1/354730010542250/0
Content-Type: application/octet-stream
Accept-Encoding: gzip
Screen: 1280-sharp720
VersionCode: 4310
SourcePath: SOSU
ImgType: webp
Host: i3.store.nearme.com.cn
Content-Length: 48

the data section is as follows:

1: 18446744073709551615
2: 19
3: 20
4: 0
5: "SM-G955N"
6: 0
7: 0
8: 3
10: 1
13: ""
15: 1

the returned data is as follows:

1: 11
2: 0
3: 0
4 {
  1: 0
  4: 0
  5: 0
  6: 0
  7: ""
  10: 0
  13: 0x0
  17: 0
  32: 0
  34: 0
  37: 0x0
  38: 0
  39: 0
  48: 0
  49: 0
  50: 0
  52: 0
  57: 0
  58: 0
  60: 0
  61: 0
  62: 0
  70: 0
  80: 0
  81: 0
  84: 0
  85: 0
  93: 0
  97: 0
  99: 0
  100: 0
  101: 0
  102: 0
  103: 0
  106: 0
  111: 0
}
4 {
  1: 20324460
  4: 0
  5: 1518344705000
  6: 77
  7: ""
  10: 9717
  13: 0x0
  15: "com.renrenche.carapp"
  16: "4.7.2"
  17: 472000
  18: ""
  19: "https://img.codeshelper.com/upload/img/2021/03/02/orqkpurbwxq2197.png.icon.h256.jpg"
  25: "http://i3.store.nearme.com.cn/client/get_down_url.pb?pid=20324460"
  32: 1
  34: 4824010
  37: 0x4045000000000000
  38: 0
  39: 684381
  48: 0
  49: 0
  50: 1
  52: 0
  54: "42"
  55: "482"
  57: 0
  58: 7
  60: 0

how can this type of data be sent within requests?