Function does not continue after catch - flutter

Question

I have a try..catch within a dart function. When the await client.post throws an error, it does not continue after the catch, why?
#override
Future<http.Response> post(url, {Map<String, String?>? headers, body, Encoding? encoding, BuildContext? context}) async {
headers = await prepareHeaders(headers);
http.Response? response = null;
try {
response = await client.post(url, headers: headers as Map<String, String>?, body: body, encoding: encoding);
} catch (_) {
debugPrint('test'); // It comes here
}
// Does not come here
log(url: url, type: 'POST', body: body as String?, response: response!);
return await parse(response, context: context);
}

Answer 1

And it shouldnt. In the code below the catch, you are relying on the response object being set. If the post errors, that wont be the case, producing more errors. Move the log and the return call inside the try block.

Answer 2

Your code almost certainly is continuing after the catch block; it's just immediately throwing another exception. If client.post throws an exception, then response will not be set and will retain its initial value of null. However, after your catch block, you do:
log(url: url, type: 'POST', body: body as String?, response: response!);
which asserts that response is not null. That will throw a TypeError.
I don't know why you aren't observing the TypeError, but I'd suspect that you have a blanket catch block somewhere higher up in the call stack that is swallowing the exception (especially given your use of catch (_) in what code you have shown). This is why Effective Dart recommends:
Avoiding catch without on.
Not catching Errors.

Answer 3

The function will not execute after the catch block, the function will be terminated after the catch whenever any exception occurred then the catch block gets called. To solve this issue you can try this.
#override
Future<http.Response> post(url, {Map<String, String?>? headers, body,
Encoding? encoding, BuildContext? context}) async {
headers = await prepareHeaders(headers);
http.Response? response = null;
try {
response = await client.post(url, headers: headers as Map<String,
String>?, body: body, encoding: encoding);
log(url: url, type: 'POST', body: body as String?, response: response!);
return await parse(response, context: context);
} catch (_) {
debugPrint('test');
rethrow;
}
}