feat: make reqwest optional but enabled by default

ethers-contract/ethers-contract-abigen/Cargo.toml

@@ -21,14 +21,17 @@ url = "2.1"
 serde_json = "1.0.61"
 serde = { version = "1.0.124", features = ["derive"] }
 hex = { version = "0.4.2", default-features = false, features = ["std"] }
-reqwest = { version = "0.11.3", features = ["blocking"] }
+reqwest = { version = "0.11.3", features = ["blocking"] , optional = true }
 once_cell = "1.8.0"
 cfg-if = "1.0.0"
 
 [target.'cfg(target_arch = "wasm32")'.dependencies]
 # NOTE: this enables wasm compatibility for getrandom indirectly
 getrandom = { version = "0.2", features = ["js"] }
 
+[features]
+default = ["reqwest"]
+
 [package.metadata.docs.rs]
 all-features = true
 rustdoc-args = ["--cfg", "docsrs"]

ethers-contract/ethers-contract-abigen/src/util.rs

@@ -1,6 +1,7 @@
 use ethers_core::types::Address;
 
 use anyhow::{anyhow, Result};
+use cfg_if::cfg_if;
 use inflector::Inflector;
 use proc_macro2::{Ident, Literal, Span, TokenStream};
 use quote::quote;
@@ -69,10 +70,15 @@ where
     Ok(address_str[2..].parse()?)
 }
 
-#[cfg(not(target_arch = "wasm32"))]
 /// Perform an HTTP GET request and return the contents of the response.
-pub fn http_get(url: &str) -> Result<String> {
-    Ok(reqwest::blocking::get(url)?.text()?)
+pub fn http_get(_url: &str) -> Result<String> {
+    cfg_if! {
+        if #[cfg(any(not(target_arch = "wasm32"), not(features = "reqwest")))]{
+            Err(anyhow!("HTTP is unsupported"))
+        } else {
+            Ok(reqwest::blocking::get(_url)?.text()?)
+        }
+    }
 }
 
 #[cfg(test)]