UIWebView canGoBack stopped working suddenly when using POST request - iphone

Question

I am loading request like this [resultsWebView loadRequest:searchRequest]; Then I do this
- (void) webViewDidFinishLoad:(UIWebView *)webView {
if ([resultsWebView canGoBack]) {
[goBackButton setEnabled:YES];
}
else {
[goBackButton setEnabled:NO];
}
if ([resultsWebView canGoForward]) {
[goForwardButton setEnabled:YES];
}
else {
[goForwardButton setEnabled:NO];
}
}
canGoBack is always returning NO.
It was working earlier, but it has stopped working suddenly(I have not done any code changes). I don't know how is this possible? Not getting any success to resolve this. There is a question on stackoverflow UIWebView canGoBack and canGoForward always return NO. But it is different as the question author was using loadData and he resolved the problem using loadRequest. But I am already using loadRequest. And again, it was working earlier, but it has stopped working suddenly(I have not done any code changes). Help me.
Cause of issue:
params = [NSString stringWithFormat:#"query=%#", searchTextField.text];
NSMutableURLRequest *searchRequest = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:#"https://www.example.com/do/m/]];
[searchRequest setHTTPMethod:#"POST"];
[searchRequest setHTTPBody:[params dataUsingEncoding:NSUTF8StringEncoding]];
If I use the simple request like below, it works fine.
NSURLRequest *searchRequest = [NSURLRequest requestWithURL:[NSURL URLWithString:[NSString stringWithFormat:#"https://www.example.com/do/m/?%#", params]] ];
Thanks

Answer 1

The request may be fail even though you can see the page successfully rendered in the web view, you also need to set those go back/forward logics to – webView:didFailLoadWithError:.

Answer 2

Finally, I found that, if the URL is same in the consecutive POST requests for the loadRequest method then canGoBack does not work. It was working for simple GET requests because URLs were different.
To fix this, I sent the consecutive POST requests with two URLs, which are different from UIWebView perspective but actually same from the server perspective. I am setting the different URLs alternatively for consecutive POST requests, by adding a question-mark(?).
https://www.example.com/do/m/
https://www.example.com/do/m/?
In this way the URLs become different for consecutive POST requests of UIWebView and canGoBack method works.
Still I donot whether it is a bug in UIWebView or we can not use consecutive POST requests with UIWebView to get the canGoBack method works.