"error decoding response body" is not enough

[Dushistov]

I use reqwest (0.12.5) like this:

let resp = client.post(url).json(&data).send().await?;
resp.json().await?;

If error occured, I got reqwest::Error, but there is no URL in it,
so println!("{err}"); just gives:

error decoding response body

Because of I use 10 different url, it is not clear what exactly happens from error.

It would be nice, if error in case of json decode error contains URL.

[Tienisto]

The debug string println!("{err:?}"); produces a more detailed information

[seanmonstar]

It also likely has the serde error as a cause, which isn't shown in the Display output on purpose. You're supposed to use some sort of error reporter if you want to crawl the error chain.

[Dushistov]

@seanmonstar @Tienisto

May be it is not clear, but Response::json does not include URL,
and that is my problem here.

Obviosly Display doesn't help here at all.

Probable fix will be:

@@ -265,9 +265,10 @@ impl Response {
     #[cfg(feature = "json")]
     #[cfg_attr(docsrs, doc(cfg(feature = "json")))]
     pub async fn json<T: DeserializeOwned>(self) -> crate::Result<T> {
+        let url = *self.url.clone();
         let full = self.bytes().await?;
 
-        serde_json::from_slice(&full).map_err(crate::error::decode)
+        serde_json::from_slice(&full).map_err(|err| crate::error::decode(err).with_url(url))
     }