get_request_builder_headers.rs

use reqwest::header;
use reqwest::ClientBuilder;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
   println!("\n[ - - - - - - - - -");

   let mut headers = header::HeaderMap::new();
   headers.insert("X-MY-HEADER", header::HeaderValue::from_static("asdfgh"));
   headers.insert("COOKIE", header::HeaderValue::from_static("__test=123456"));
   
   // `Client`
   /*
   let client = reqwest::Client::builder()
   .default_headers(headers)
   .build()?;
   */

   // `ClientBuilder`
   let client = ClientBuilder::new().build()?;

   // `RequestBuilder`
   let r :reqwest::Request = client.get("http://dadou.run/my").headers(headers).build()?;
   println!("client_Headers: {:#?}", r.headers());
   
   // `Response`
   let resp :reqwest::Response = client.execute(r).await?;
   println!("\n Status: {} \n", resp.status());
   println!("server_Headers: {:#?}", resp.headers());
   let body :String = resp.text().await?;
   println!("\nBody: {}", body);
   
   println!("- - - - - - - - - ]\n");
   Ok(())
}

/*
[ - - - - - - - - -
client_Headers: {
    "x-my-header": "asdfgh",
    "cookie": "__test=123456",
}

 Status: 200 OK

server_Headers: {
    "server": "nginx",
    "date": "Sun, 17 Aug 2025 07:22:45 GMT",
    "content-type": "application/json",
    "content-length": "407",
    "connection": "keep-alive",
    "vary": "Accept-Encoding",
}

Body: {"request_id": "719c8ef013233fd7f12b8039666250ef","request_method": "GET","request_time": "0.000","request_body": "","request_l
ength": "101","request_time": "0.000","user_agent": "","via": "","x_forwarded_for": "","proxy_protocol_addr": "","proxy_protocol_port
": "","client_ip": "185.228.105.43","client_port": "2191","server": "Parrot/1.0.2","server_protocol": "HTTP/1.1","at": "2025-08-17T15
:22:45+08:00"}
- - - - - - - - - ]
*/