Remove redundant unwrap from an ContentType header insert

near-rpc/src/rpc/client.rs

@@ -1,5 +1,5 @@
 use reqwest::{
-    header::{HeaderMap, CONTENT_TYPE},
+    header::{HeaderMap, HeaderValue, CONTENT_TYPE},
     Client, ClientBuilder, Response as Resp,
 };
 use serde::{Deserialize, Serialize};
@@ -25,8 +25,7 @@ impl RpcClient {
     /// - url - It's an RPC endpoint [`Url`]
     pub(crate) fn new(url: Url) -> Result<Self> {
         let mut headers = HeaderMap::new();
-        // It can't panic
-        headers.insert(CONTENT_TYPE, "application/json".parse().unwrap());
+        headers.insert(CONTENT_TYPE, HeaderValue::from_static("application/json"));
         let client = ClientBuilder::new()
             .default_headers(headers)
             .build()