how to create post on blogger .com without browser using http client

[jattdagar]

how to create post on blogger .com without browser using http client
complete procedure
do i need to activate api or not if yes then how

[jattdagar]

after searching google i found this

POST https://www.googleapis.com/blogger/v3/blogs/8070105920543249955/posts/
Authorization: /* OAuth 2.0 token here */
Content-Type: application/json

{
"kind": "blogger#post",
"blog": {
"id": "8070105920543249955"
},
"title": "A new post",
"content": "With <b>exciting</b> content..."
}

but it required login i shows me this error

Url: https://www.googleapis.com/blogger/v3/blogs/4592753991783818024/posts/
Status: 401

Vary: X-Origin
WWW-Authenticate: Bearer realm="https://accounts.google.com/"
Content-Type: application/json; charset=UTF-8
Date: Mon, 02 Dec 2019 06:07:48 GMT
Expires: Mon, 02 Dec 2019 06:07:48 GMT
Cache-Control: private, max-age=0
X-Content-Type-Options: nosniff
X-Frame-Options: SAMEORIGIN
X-XSS-Protection: 1; mode=block
Server: GSE
Alt-Svc: quic=":443"; ma=2592000; v="46,43",h3-Q050=":443"; ma=2592000,h3-Q049=":443"; ma=2592000,h3-Q048=":443"; ma=2592000,h3-Q046=":443"; ma=2592000,h3-Q043=":443"; ma=2592000
Accept-Ranges: none
Vary: Origin,Accept-Encoding
Transfer-Encoding: chunked

{
"error": {
"errors": [
{
"domain": "global",
"reason": "required",
"message": "Login Required",
"locationType": "header",
"location": "Authorization"
}
],
"code": 401,
"message": "Login Required"
}
}

pls tell me how to login and post