reqwest::ClientBuilder is erroring out silently

1

Hi there, I am a newbie on rust, came across a problem on reqwest client


mod utils;
use reqwest::ClientBuilder;
use std::io::{self, Write};


#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    println!("Initializing client:");

    let client = match ClientBuilder::new().build() {
        Ok(client) => {
            println!("Done building reqwest client");
            io::stdout().flush().unwrap();
            client
        },
        Err(e) => {
            eprintln!("Error creating HTTP client: {}", e);  // Print the error message
            println!("Error creating HTTP client: {:?}, Error Type: {:?}", e, e);
            io::stderr().flush().unwrap();
            // Box the `reqwest::Error` to match the expected `Box<dyn std::error::Error>` type
            return Err(Box::new(e) as Box<dyn std::error::Error>);
        }
    };

    println!("Done creating  client:");

    Ok(())
}

I noticed that the code is not printing out any messages from OK or Err. It only prints "Initializing client:." I cannot reproduce it locally on my Windows machine. Please let me know what could be wrong with this code.

2

After removing the strange second main function that sets a panic hook (which you since removed from your snippet as well), your code runs fine on the playground:

Initializing client:
Done building reqwest client
Done creating  client:
3

Thank you. Yes that was a copy/paste error.

I've updated my code to the following:

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    println!("Creating client");

    let result = panic::catch_unwind(|| {
        // Create the reqwest client
        let client = reqwest::Client::new();
        println!("Client created: {:?}", client);
    });

    match result {
        Ok(_) => println!("Client created successfully"),
        Err(e) => {
            println!("Error creating client: {:?}", e);
            return Err("Failed to create client".into());
        }
    }

    Ok(())
}

This code run fine on my windows machine. But on an alpine image, only the first statement, "Creating client" is printed. Does the reqwest::Client not work on Alpine?

4

I'm not sure what the cause of this is. What features have you enabled? Maybe try disabling the default features and see if you can get ClientBuilder::build to finish? You can disable the default features in your manifest like this:

[dependencies]
reqwest = { version = "0.12", default-features = false }