actix_web middleware ErrorHandlers return error message in ServiceResponse
Full error message
I am trying to capture errors that may occur for requests made to my server.
This came up when I was receiving a 400 on one of my POST requests (which was thrown before even getting to my request handler method) and I was receiving no feedback as to what the issue was after enabling the debug logs I saw the issue
[actix_web::types::json] Failed to deserialize Json from payload. Request path: /new_endpoint
Json deserialize error: invalid length: expected one of [36, 32], found 10 at line 2 column 20
[DEBUG actix_web::middleware::logger] Error in response: Deserialize(Error("invalid length: expected one of [36, 32], found 10", line: 2, column: 20))
Now, I want to be able to capture that error so that it can be sent back in the body of the 400 response.
I've started with
App::new()
.wrap(ErrorHandlers::new().handler(http::StatusCode::BAD_REQUEST, handle_bad_request))
and in handle_bad_request I am able to modify the response body to contain new information
fn handle_bad_request<B>(mut res: dev::ServiceResponse<B>) -> Result<ErrorHandlerResponse<Body>> {
res.response_mut().headers_mut().insert(
http::header::CONTENT_TYPE,
http::HeaderValue::from_static("application/json"),
);
let new_res: ServiceResponse<Body> = res.map_body(|_head, _body| {
ResponseBody::Other(Body::Message(Box::new("New Response Body")))
});
Ok(ErrorHandlerResponse::Response(new_res))
}
Ideally what I want to do is take the error in ServiceResponse and send it back in the response. I am able to read the error by doing
match res.response().error() {
Some(e) => println!("{0}", e),
None => println!("Error None")
};
but as for actually taking that error and sending it back in the response I am not able to figure that out.Solutionsource: stackoverflow \u2197
To solve this format!("{:?}", res.reponse().error()) was needed. That does return Some(error message) so just to account for that the following worked. let errorMsg: String = match res.response().error() { Some(e) => format!("{:?}", e), None => String::from("Unknown Error") }; let new_res: ServiceResponse<Body> = res.map_body(|_head, _body| { ResponseBody::Other(Body::Message(Box::new(errorMsg))) }); Ok(ErrorHandlerResponse::Response(new_res))
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