I want to handle the error in response by match - rust

Question

I am receiving a response through the server, and when I am working on the error using match, I get an error during operation, and I do not know how to solve this error. Please help
let host_clint = Client::new();
let response = host_clint
.post("https://xnbng--80ak6aa92e.com")
.form(&hashmap)
.send()?;
let respose_req = match response.json::<USER>(){
Ok(data) => data,
Err(err) => {
println!("Error while receiving response body: {}", err);
}
};
Error:
error[E0308]: `match` arms have incompatible types
--> src\main.rs:268:13
|
265 | let respose_req = match response.json::<USER>(){
| ----------------------------------- `match` arms have incompatible types
266 | Ok(data) => data,
| ---- this is found to be of type `USER`
267 | Err(err) => {
268 | println!("Error while receiving response body: {}", err);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected struct `USER`, found `()`
|
= note: this error originates in the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)

Answer 1

If you use match to assign a value to a variable, you have to return a value of the same type in both match conditions. The Ok condition returns data which is of type user, but the Err condition does only print a line to stdout and does not return a value that can be assigned to response_req.
let respose_req = match response.json::<USER>(){
Ok(data) => data, // <-- Returns the value from 'data' of type USER
Err(err) => {
println!("Error while receiving response body: {}", err); // <-- Returns nothing, just prints a line to the stdout
}
};
So, you have to return some value of the type 'user' in every match condition. But I recommend wrapping it into an option like so:
let respose_req: Option<USER> = match response.json::<USER>(){
Ok(data) => Some(data),
Err(err) => {
println!("Error while receiving response body: {}", err);
None
}
};
Or you could just handle the error like so:
let response_req = response.json::<USER>();
if let Err(err) = response_req {
println!("Error while receiving response body: {}", err);
// here you have to prevent your code from further execution by using break or return.
}
// now you can just safely unwrap response_req whenever you use it because the error case is already handled.
response_req.unwrap().DO_SOME_STUFF()