用于后台文件传输的 GCDWebServer 处理程序(不是 GCDWebUploader)

Question

有没有人已经尝试在不使用包含的（和酷的）GCDWebUploader的情况下为GET请求实现处理程序（POST方法的相同问题）？

我需要服务器在将文件上传到客户端http://local/download/filename.ext响应 GET 请求。

我正在使请求符合代码"后台会话管理器"（可在此处获得：AFNetworking 2.0和后台传输），并且它被发送并触发了无忧无虑。

我得到的服务器端日志如下：

[DEBUG] Did start background task
[DEBUG] Connection received 248 bytes on socket 14
[DEBUG] Connection on socket 14 preflighting request "GET /download/file.ext with 248 bytes body
[DEBUG] Connection on socket 14 processing request "GET /download/file.ext" with 248 bytes body
[EXCEPTION] *** +[NSJSONSerialization dataWithJSONObject:options:error:]: value parameter is nil
[DEBUG] Did close connection on socket 14

我无法弄清楚如何设置处理程序，以便不关心从 JSON 解析不存在的查询。

[webServer addHandlerForMethod:@"GET" path:@"/download" requestClass:[GCDWebServerRequest class] processBlock:^GCDWebServerResponse *(GCDWebServerRequest* request) {
        __strong AppDelegate* strongSelf = weakSelf;
        NSLog(@"request for download is %@", request);
        return [strongSelf downloadFile:request];
    }];

Answer 1

我删除了这段代码以使其工作：

/*
 // Add a handler to respond to GET requests
[webServer addDefaultHandlerForMethod:@"GET"
                             requestClass:[GCDWebServerRequest class]
                        asyncProcessBlock:^(GCDWebServerRequest* request, GCDWebServerCompletionBlock completionBlock) {
                            __strong AppDelegate* strongSelf = weakSelf;
.....
*/
[webServer addHandlerForMethod:@"GET" path:@"/download" requestClass:[GCDWebServerRequest class] processBlock:^GCDWebServerResponse *(GCDWebServerRequest* request) {
    __strong AppDelegate* strongSelf = weakSelf;
    NSLog(@"request for download is %@", request);
    return [strongSelf downloadFile:request];
}];

注释掉了接管并无论如何都需要 JSON 数据包的默认处理程序。

更新

为了使用GCDWebServer和NSURLSessions（即使使用AFNetworking）实现后台文件传输，对我来说最好的方法是使用MatchBlock实例化GET处理程序，如下所示：

[webServer addHandlerWithMatchBlock:^GCDWebServerRequest *(NSString* requestMethod, NSURL* requestURL, NSDictionary* requestHeaders, NSString* urlPath, NSDictionary* urlQuery) {
        if (![requestMethod isEqualToString:@"GET"]) {
            return nil;
        }
        if (![urlPath hasPrefix:@"/download"]) {
            return nil;
        }
        return [[GCDWebServerRequest alloc] initWithMethod:requestMethod url:requestURL headers:requestHeaders path:urlPath query:urlQuery];
    } processBlock:^GCDWebServerResponse *(GCDWebServerRequest* request) {
        GCDWebServerResponse* response = nil;
        NSString* filePath = [[weakSelf applicationDocumentsDirectory] stringByAppendingPathComponent:[[request.path stringByRemovingPercentEncoding]];
        NSString* fileType = [[[NSFileManager defaultManager] attributesOfItemAtPath:filePath error:NULL] fileType];
        if (fileType) {
            if ([fileType isEqualToString:NSFileTypeRegular]) {
                    // always allow ranges in our requests
                    response = [GCDWebServerFileResponse responseWithFile:filePath byteRange:request.byteRange];
                    [response setValue:@"bytes" forAdditionalHeader:@"Accept-Ranges"];
            }
        }
        if (response) {
            response.cacheControlMaxAge = 360;
        } else {
            response = [GCDWebServerResponse responseWithStatusCode:kGCDWebServerHTTPStatusCode_NotFound];
        }
        return response;
    }];