Input: Add HTTP Status Code Checks (#190)

`HttpRequest`s will now return an `AudioStreamError::Fail` on receipt of a non-2xx status code from a server. This has the advantage of making it clearer *why* a failure occurred rather than leaving users to piece the truth together from a Symphonia parsing error.

Closes #184.

src/input/sources/http.rs

@@ -13,6 +13,7 @@ use reqwest::{
     header::{HeaderMap, ACCEPT_RANGES, CONTENT_LENGTH, CONTENT_TYPE, RANGE, RETRY_AFTER},
     Client,
 };
+use std::fmt::format;
 use std::{
     io::{Error as IoError, ErrorKind as IoErrorKind, Result as IoResult, SeekFrom},
     pin::Pin,
@@ -82,6 +83,12 @@ impl HttpRequest {
             .await
             .map_err(|e| AudioStreamError::Fail(Box::new(e)))?;
 
+        if !resp.status().is_success() {
+            let msg: Box<dyn std::error::Error + Send + Sync + 'static> =
+                format!("failed with http status code: {}", resp.status()).into();
+            return Err(AudioStreamError::Fail(msg));
+        }
+
         if let Some(t) = resp.headers().get(RETRY_AFTER) {
             t.to_str()
                 .map_err(|_| {