feat(http): add plugin (#325)

plugins/http/src/error.rs

@@ -0,0 +1,38 @@
+use std::path::PathBuf;
+
+use reqwest::Url;
+use serde::{Serialize, Serializer};
+
+#[derive(Debug, thiserror::Error)]
+pub enum Error {
+    #[error(transparent)]
+    Json(#[from] serde_json::Error),
+    #[error(transparent)]
+    Io(#[from] std::io::Error),
+    #[error(transparent)]
+    Network(#[from] reqwest::Error),
+    /// URL not allowed by the scope.
+    #[error("url not allowed on the configured scope: {0}")]
+    UrlNotAllowed(Url),
+    /// Path not allowed by the scope.
+    #[error("path not allowed on the configured scope: {0}")]
+    PathNotAllowed(PathBuf),
+    /// Client with specified ID not found.
+    #[error("http client dropped or not initialized")]
+    HttpClientNotInitialized,
+    /// HTTP method error.
+    #[error(transparent)]
+    HttpMethod(#[from] http::method::InvalidMethod),
+    /// Failed to serialize header value as string.
+    #[error(transparent)]
+    Utf8(#[from] std::string::FromUtf8Error),
+}
+
+impl Serialize for Error {
+    fn serialize<S>(&self, serializer: S) -> std::result::Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        serializer.serialize_str(self.to_string().as_ref())
+    }
+}