我正在构建一个简单的 http POST 请求。在这篇文章中，我需要添加一些项目，其中之一是一个大的视图状态字符串，该字符串在上一个请求期间被拉下来。我注意到原始请求需要转义所有特殊字符（如下所示）
_EVENTTARGET=&_EVENTARGUMENT=&__VIEWSTATE=%%3D&
但我不确定我是否在 Objective-c 中做到了这一点。目前，当我 NSLog 出视图状态字符串时，它仍然显示 / 和 = 字符。
任何人都可以验证我在这里走的是正确的道路吗？如果不是，我将如何转换视图状态中的特殊字符（即 - 而不是 = 我应该得到 %3D）？
- (void)doHttpPostWithViewState:(NSString *)viewstate
{
responseData = [[NSMutableData data] retain];
NSURL *url = [NSURL URLWithString:@"https://localhost/Login"];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60.0];
NSString* theBodyString = [[NSString alloc] initWithFormat:@"__EVENTTARGET=&__EVENTARGUMENT=&__VIEWSTATE=%@",viewstate];
NSData *requestData = [theBodyString dataUsingEncoding:NSUTF8StringEncoding];
NSDictionary * headers = [NSHTTPCookie requestHeaderFieldsWithCookies:cookies];
[request setHTTPMethod:@"POST"];
[request setValue:@"text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8" forHTTPHeaderField:@"Accept"];
[request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];
[request setValue:[NSString stringWithFormat:@"%d", [requestData length]] forHTTPHeaderField:@"Content-Length"];
[request setHTTPBody: requestData];
[request setAllHTTPHeaderFields:headers];
[[NSURLConnection alloc] initWithRequest:request delegate:self];
}
最后，出于本地调试目的 - 如何使用 NSLog 查看将发送到客户端的最终（原始）字符串？先感谢您！
更新
事实证明，这是 stringByAddingPercentEscapesUsingEncoding 方法中的一个错误，
我发现以下内容可以从 此博客文章
NSString * cleanViewState = (NSString *)CFURLCreateStringByAddingPercentEscapes(
NULL,
(CFStringRef)viewstate,
NULL,
(CFStringRef)@"!*'();:@&=+$,/?%#[]",
kCFStringEncodingUTF8 );
I'm building a request that will be a simple http POST. Inside this post I need to add a few items and one of these is a large viewstate string that is pulled down during a previous request. What I've noticed is that the raw request needs to have all special chars escaped (like the below)
_EVENTTARGET=&_EVENTARGUMENT=&__VIEWSTATE=%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%3D&
But I'm not certain that I've done this in objective-c. Currently when I NSLog out the viewstate string it is still showing / and = characters.
Can anyone verify I'm on the right path here? And if not how would I convert the special chars in viewstate (ie - instead of = I should get %3D)?
- (void)doHttpPostWithViewState:(NSString *)viewstate
{
responseData = [[NSMutableData data] retain];
NSURL *url = [NSURL URLWithString:@"https://localhost/Login"];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60.0];
NSString* theBodyString = [[NSString alloc] initWithFormat:@"__EVENTTARGET=&__EVENTARGUMENT=&__VIEWSTATE=%@",viewstate];
NSData *requestData = [theBodyString dataUsingEncoding:NSUTF8StringEncoding];
NSDictionary * headers = [NSHTTPCookie requestHeaderFieldsWithCookies:cookies];
[request setHTTPMethod:@"POST"];
[request setValue:@"text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8" forHTTPHeaderField:@"Accept"];
[request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];
[request setValue:[NSString stringWithFormat:@"%d", [requestData length]] forHTTPHeaderField:@"Content-Length"];
[request setHTTPBody: requestData];
[request setAllHTTPHeaderFields:headers];
[[NSURLConnection alloc] initWithRequest:request delegate:self];
}
And finally, for local debugging purposes- how can I use NSLog to view the final (raw) string that will be sent to the client? Thank you in advance!
Update
Turns out this is a bug in the stringByAddingPercentEscapesUsingEncoding method
I've found the following to work from this blog post
NSString * cleanViewState = (NSString *)CFURLCreateStringByAddingPercentEscapes(
NULL,
(CFStringRef)viewstate,
NULL,
(CFStringRef)@"!*'();:@&=+$,/?%#[]",
kCFStringEncodingUTF8 );
发布评论
评论（1）
您可能正在寻找 NSString 对您的 POST 请求进行%编码。
更新：
如果 NSString 方法没有获取您需要的所有特殊字符，下一步是下拉到 Core Foundation 级别函数 (CFURLCreateStringByAddingPercentEscapes)，这可以让您更好地控制。请参阅http://simonwoodside.com/weblog/2009/4/22/how_to_really_url_encode/< /a>
You're probably looking for the
stringByAddingPercentEscapesUsingEncoding:method on NSString to %-encode your POST request.Update:
If the NSString method isn't getting all the special characters you need, the next step is to drop down to the Core Foundation level function (CFURLCreateStringByAddingPercentEscapes), which gives you better control. See http://simonwoodside.com/weblog/2009/4/22/how_to_really_url_encode/