Flutter'sTry Catch never works - flutter

Question

I tried everything.. I always have some problem with async try catch blocks..
I read the guide that flutter has on it but nothing there works.. i am trying to make http requests, but whenever there is a problem like (connection refused) it breaks the code. i tried:
try {
switch (type) {
case RequestType.Get:
response = await _httpClient
.get(url, headers: headers)
.catchError(catchError);
break;
case RequestType.Put:
try {
response = await _httpClient
.put(url, body: body, headers: headers)
.catchError(catchError);
} catch (e) {
catchError();
}
break;
case RequestType.Post:
response = await _httpClient
.post(url, body: body, headers: headers)
.catchError(catchError);
break;
default:
return null;
break;
}
} catch (e) {
catchError();
}
I tried every combination there.. with async catchError only.. with try catch only.. with try catch above the switch, with try catch only on the http request.. NOTHING works.. How can this be done????

Answer 1

Keep one try...catch for all, keep it simple:
Future doRequest(type, url, headers) async {
try {
switch (type) {
case RequestType.Get: return await _httpClient.get(url, headers: headers);
case RequestType.Put: return await _httpClient.put(url, body: body, headers: headers);
case RequestType.Post: return await _httpClient.post(url, body: body, headers: headers);
}
throw('Method not supported');
} catch (e) {
// print exception to console
// or comment the line, if You don't care about error
print(e.error);
return null;
}
}
or avoid using try...catch in this logic and handle issue on higher level.
Future doRequest(type, url, headers) {
switch (type) {
case RequestType.Get: return _httpClient.get(url, headers: headers);
case RequestType.Put: return _httpClient.put(url, body: body, headers: headers);
case RequestType.Post: return _httpClient.post(url, body: body, headers: headers);
}
throw('Method not supported');
}
try {
final response = await doRequest(RequestType.Get, "some/url/here", {});
/* do something with response */
}
catch (error) {
//handle error here
}