feat(client): Add impersonate_with_headers allows optionally settin…

…g request headers (#127)

examples/impersonate_with_headers.rs

@@ -0,0 +1,18 @@
+use rquest::tls::Impersonate;
+use std::error::Error;
+
+#[tokio::main]
+async fn main() -> Result<(), Box<dyn Error>> {
+    // Build a client to mimic Edge127 with headers
+    let client = rquest::Client::builder()
+        .impersonate_with_headers(Impersonate::Edge127, false)
+        .enable_ech_grease()
+        .permute_extensions()
+        .build()?;
+
+    // Use the API you're already familiar with
+    let resp = client.get("https://tls.peet.ws/api/all").send().await?;
+    println!("{}", resp.text().await?);
+
+    Ok(())
+}

src/client/client.rs

@@ -264,29 +264,52 @@ impl ClientBuilder {
     /// This is only available with the `boring-tls` feature.
     #[cfg(feature = "boring-tls")]
     pub fn impersonate(self, impersonate: Impersonate) -> ClientBuilder {
+        self.impersonate_with_headers(impersonate, true)
+    }
+
+    /// Sets the necessary values to mimic the specified impersonate version (with headers).
+    /// This will set the necessary headers and TLS settings.
+    /// This is only available with the `boring-tls` feature.
+    #[cfg(feature = "boring-tls")]
+    pub fn impersonate_with_headers(
+        self,
+        impersonate: Impersonate,
+        set_headers: bool,
+    ) -> ClientBuilder {
         // Try to get the settings for the impersonate version
-        if let Ok((settings, func)) = tls::tls_settings(impersonate) {
-            return self.apply_tls_settings(settings, func);
+        if let Ok((settings, header_initializer)) = tls::tls_settings(impersonate) {
+            return self.apply_tls_settings(settings, header_initializer, set_headers);
         }
         self
     }
 
     /// Use the preconfigured TLS settings.
     #[cfg(feature = "boring-tls")]
-    pub fn use_preconfigured_tls<F>(self, settings: TlsSettings, func: F) -> ClientBuilder
+    pub fn use_preconfigured_tls<F>(
+        self,
+        settings: TlsSettings,
+        header_initializer: F,
+    ) -> ClientBuilder
     where
         F: FnOnce(&mut HeaderMap),
     {
-        self.apply_tls_settings(settings, func)
+        self.apply_tls_settings(settings, header_initializer, true)
     }
 
     /// Apply the given TLS settings and header function.
     #[cfg(feature = "boring-tls")]
-    fn apply_tls_settings<F>(mut self, settings: TlsSettings, func: F) -> ClientBuilder
+    fn apply_tls_settings<F>(
+        mut self,
+        settings: TlsSettings,
+        header_initializer: F,
+        set_headers: bool,
+    ) -> ClientBuilder
     where
         F: FnOnce(&mut HeaderMap),
     {
-        func(&mut self.config.headers);
+        if set_headers {
+            header_initializer(&mut self.config.headers);
+        }
         self.config.tls.builder = Some(settings.builder);
         self.config.tls.extension = settings.extension;