diff --git a/README.md b/README.md
index daa278555..3948ec884 100644
--- a/README.md
+++ b/README.md
@@ -59,6 +59,7 @@ A typed GraphQL client library for Rust.
   ```rust
   use graphql_client::{GraphQLQuery, Response};
   use std::error::Error;
+  use reqwest;
 
   #[derive(GraphQLQuery)]
   #[graphql(
@@ -68,14 +69,14 @@ A typed GraphQL client library for Rust.
   )]
   pub struct UnionQuery;
 
-  fn perform_my_query(variables: union_query::Variables) -> Result<(), Box<dyn Error>> {
+  async fn perform_my_query(variables: union_query::Variables) -> Result<(), Box<dyn Error>> {
 
       // this is the important line
       let request_body = UnionQuery::build_query(variables);
 
       let client = reqwest::Client::new();
-      let mut res = client.post("/graphql").json(&request_body).send()?;
-      let response_body: Response<union_query::ResponseData> = res.json()?;
+      let mut res = client.post("/graphql").json(&request_body).send().await?;
+      let response_body: Response<union_query::ResponseData> = res.json().await?;
       println!("{:#?}", response_body);
       Ok(())
   }
diff --git a/examples/github/examples/github.rs b/examples/github/examples/github.rs
index 278d24e39..833ee757b 100644
--- a/examples/github/examples/github.rs
+++ b/examples/github/examples/github.rs
@@ -51,7 +51,9 @@ fn main() -> Result<(), anyhow::Error> {
         name: name.to_string(),
     });
 
-    let client = reqwest::blocking::Client::new();
+    let client = reqwest::blocking::Client::builder()
+        .user_agent("graphql-rust/0.9.0")
+        .build()?;
 
     let res = client
         .post("https://api.github.com/graphql")
@@ -59,17 +61,11 @@ fn main() -> Result<(), anyhow::Error> {
         .json(&q)
         .send()?;
 
+    res.error_for_status_ref()?;
+
     let response_body: Response<repo_view::ResponseData> = res.json()?;
     info!("{:?}", response_body);
 
-    if let Some(errors) = response_body.errors {
-        println!("there are errors:");
-
-        for error in &errors {
-            println!("{:?}", error);
-        }
-    }
-
     let response_data: repo_view::ResponseData = response_body.data.expect("missing response data");
 
     let stars: Option<i64> = response_data
@@ -80,8 +76,8 @@ fn main() -> Result<(), anyhow::Error> {
     println!("{}/{} - 🌟 {}", owner, name, stars.unwrap_or(0),);
 
     let mut table = prettytable::Table::new();
-
-    table.add_row(row!(b => "issue", "comments"));
+    table.set_format(*prettytable::format::consts::FORMAT_NO_LINESEP_WITH_TITLE);
+    table.set_titles(row!(b => "issue", "comments"));
 
     for issue in &response_data
         .repository
diff --git a/graphql_client/Cargo.toml b/graphql_client/Cargo.toml
index 0d5b5daca..c3fae68ee 100644
--- a/graphql_client/Cargo.toml
+++ b/graphql_client/Cargo.toml
@@ -41,6 +41,7 @@ optional = true
 [dev-dependencies]
 # Note: If we bumpup wasm-bindge-test version, we should change CI setting.
 wasm-bindgen-test = "^0.3"
+reqwest = { version = "^0.10", features = ["json", "blocking"] }
 
 [features]
 default = ["graphql_query_derive"]
diff --git a/graphql_client/src/web.rs b/graphql_client/src/web.rs
index 0db9351c2..7242c7331 100644
--- a/graphql_client/src/web.rs
+++ b/graphql_client/src/web.rs
@@ -79,7 +79,7 @@ impl Client {
         _query: Q,
         variables: Q::Variables,
     ) -> Result<crate::Response<Q::ResponseData>, ClientError> {
-        let window = web_sys::window().ok_or_else(|| ClientError::NoWindow)?;
+        let window = web_sys::window().ok_or(ClientError::NoWindow)?;
         let body =
             serde_json::to_string(&Q::build_query(variables)).map_err(|_| ClientError::Body)?;