使用带有UIWebView和POST请求的自定义NSURLProtocol [英] Using a custom NSURLProtocol with UIWebView and POST requests

问题描述

在我的iOS应用中，我使用的是UIWebView和自定义协议（使用我自己的NSURLProtocol实现）。我一直非常小心确保每当我加载一个url时，我将这样的内容加载到我的UIWebView中：

In my iOS app, I'm using a UIWebView and a custom protocol (with my own NSURLProtocol implementation). I've been fairly careful about making sure that whenever I load a url, I load something like this into my UIWebView:

myprotocol：// myserver / mypath

myprotocol://myserver/mypath

在我的NSURLProtocol实现中，我获取NSURLRequest的可变副本，将URL转换为http：并将其发送到我的服务器。

and in my NSURLProtocol implementation, I take a mutable copy of the NSURLRequest, convert the URL to http: and send that to my server.

一切都适用于HTTP GET请求。我遇到的问题是POST请求。如果请求使用我的自定义协议，似乎UIWebView没有正确编码HTTPBody中的表单数据。

Everything works for HTTP GET requests. The problem I encounter is with POST requests. It seems like the UIWebView doesn't properly encode the form data in the HTTPBody if the request uses my custom protocol.

一个解决方法，因为我使用HTTPS对于我的服务器请求，是我注册我的协议处理程序来拦截http：而不是myprotocol：我可以将所有调用转换为https：另一个问题，这里，指向我解决方案：

One work-around, since I'm using HTTPS for my server requests, is that I register my protocol handler to intercept http: instead of myprotocol: and I can convert all calls to https: This other question, here, pointed me toward that solution:

但是我我想知道是否有任何替代和/或更好的方法来实现我想要的东西。

But I'm wondering if there's any alternative and/or better way of accomplishing what I want.

推荐答案

而不是尝试使用POST请求，一个解决方法是继续使用 myprotocol：// URL的GET请求，但在 NSURLProtocol 实现中转换它们使用请求查询字符串作为POST的主体，向服务器发送 http：// 和 POST请求。

Instead of trying to use POST requests, one work around is to continue using GET requests for myprotocol:// URLs, but transform them in your NSURLProtocol implementation to an http:// and POST request to your server using the request query string as the body of the POST.

使用GET请求发送大量数据的担忧是在请求链的某个地方，请求行可能会被截断。然而，这似乎不是一个问题，使用本地实现的协议。

The worry with using GET requests to send large amounts of data is that somewhere along the request chain, the request line might get truncated. This appears to not be a problem, however, with locally-implemented protocols.

我写了一个简短的Cordova测试应用程序进行实验，我发现我能够通过超过1 MiB的数据，没有麻烦的HTTP请求回显服务 http://http-echo.jgate.de/

I wrote a short Cordova test app to experiment and I found that I was able to send through a little over 1 MiB of data without trouble to the HTTP request echoing service http://http-echo.jgate.de/

这是我的 startLoading 实施：

- (void)startLoading {
    NSURL *url = [[self request] URL];
    NSString *query = [url query];
    // Create a copy of `url` without the query string.
    url = [[[NSURL alloc] initWithScheme:@"http" host:@"http-echo.jgate.de" path:[url path]] autorelease];
    NSMutableURLRequest *newRequest = [NSMutableURLRequest requestWithURL:url];
    [newRequest setHTTPMethod:@"POST"];
    [newRequest setAllHTTPHeaderFields:[[self request] allHTTPHeaderFields]];
    [newRequest addValue:@"close" forHTTPHeaderField:@"Connection"];
    [newRequest addValue:@"application/x-www-form-urlencoded;charset=UTF-8" forHTTPHeaderField:@"Content-Type"];
    [newRequest setHTTPBody:[query dataUsingEncoding:NSUTF8StringEncoding]];
    urlConnection = [[NSURLConnection alloc] initWithRequest:newRequest delegate:self];
    if (urlConnection) {
        receivedData = [[NSMutableData data] retain];
    }
}

然后我实现了 NSURLConnection 转发到相应的 NSURLProtocolClient 方法的协议方法，但是在转发编码的情况下构建响应数据： chunked （就像 http://http-echo.jgate.de/）。

I then implemented the NSURLConnection protocol methods to forward to the appropriate NSURLProtocolClient method, but building up the response data in the case of Transfer-Encoding:chunked (as is the case for responses from http://http-echo.jgate.de/).

这篇关于使用带有UIWebView和POST请求的自定义NSURLProtocol的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！