Replace unwraps with expect, explaining the situation

src/api.rs

@@ -103,7 +103,10 @@ pub async fn create_recording(
     let legacy_fallback = (response.status().as_u16() == 413)
         .then(|| "The recording exceeds the server-configured size limit".to_owned());
 
-    let server_hostname = server_url.host().unwrap().to_string();
+    let server_hostname = server_url
+        .host()
+        .expect("host presence is checked in parse_server_url")
+        .to_string();
     let response = handle_response_status(response, &server_hostname, legacy_fallback).await?;
 
     Ok(response.json::<RecordingResponse>().await?)
@@ -236,7 +239,10 @@ async fn parse_stream_response<T: DeserializeOwned>(
     response: Response,
     server_url: &Url,
 ) -> Result<T> {
-    let server_hostname = server_url.host().unwrap().to_string();
+    let server_hostname = server_url
+        .host()
+        .expect("host presence is checked in parse_server_url")
+        .to_string();
 
     let legacy_fallback = match response.status().as_u16() {
         404 | 422 => Some(format!("{server_hostname} doesn't support streaming")),

src/cmd/auth.rs

@@ -8,7 +8,9 @@ impl cli::Auth {
     pub fn run(self) -> Result<()> {
         let mut config = Config::new(self.server_url.clone())?;
         let server_url = config.get_server_url()?;
-        let server_hostname = server_url.host().unwrap();
+        let server_hostname = server_url
+            .host()
+            .expect("host presence is checked in parse_server_url");
         let auth_url = api::get_auth_url(&mut config)?;
 
         println!("Open the following URL in a web browser to authenticate this CLI with your {server_hostname} user account:\n");

src/file_output.rs

@@ -200,7 +200,11 @@ async fn send_command(
 }
 
 fn make_header(metadata: &Metadata) -> asciicast::Header {
-    let timestamp = metadata.time.duration_since(UNIX_EPOCH).unwrap().as_secs();
+    let timestamp = metadata
+        .time
+        .duration_since(UNIX_EPOCH)
+        .ok()
+        .map(|d| d.as_secs());
 
     asciicast::Header {
         term_cols: metadata.term.size.0,
@@ -208,7 +212,7 @@ fn make_header(metadata: &Metadata) -> asciicast::Header {
         term_type: metadata.term.type_.clone(),
         term_version: metadata.term.version.clone(),
         term_theme: metadata.term.theme.clone(),
-        timestamp: Some(timestamp),
+        timestamp,
         idle_time_limit: metadata.idle_time_limit,
         command: metadata.command.clone(),
         title: metadata.title.clone(),