Question

我正在使用包含数百个位置点的文档设置异步发布请求。我想将此文档保存在我的couchdb中。

对于小文档，请求响应在很短的时间内返回，存储文档。当文档增长一点（仍然<~200k）时，响应需要很长时间，然后以超时返回。我将超时设置为120秒。

我错过了一些设置或编码错误吗？

- (void)post:(NSData*) requestBody {
    startTime = [NSDate date];
    NSURL* serverURL = [NSURL URLWithString: @"https://myUser:myPassword@myAcc.cloudant.com/myDB"];
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:serverURL];
    [request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
    [request setHTTPMethod:@"POST"];
    [request setTimeoutInterval:120.0];

    [request setHTTPBody:requestBody];


    [NSURLConnection sendAsynchronousRequest:request queue:[[NSOperationQueue alloc] init] completionHandler:^(NSURLResponse *response, NSData *data, NSError *error)
    {
        if (response != nil) {
            if ([response respondsToSelector:@selector(statusCode)])
            {
                int statusCode = [((NSHTTPURLResponse *)response) statusCode];
                NSLog(@"StatusCode returned was %i", statusCode);
            }
            NSLog(@"Response: %@",response);
        }

         if ([data length] >0 && error == nil)
         {
             NSLog(@"data: %@", data);
             // DO YOUR WORK HERE

         }
         else if ([data length] == 0 && error == nil)
         {
             NSLog(@"Nothing was downloaded.");
         }
         else if (error != nil){
             NSLog(@"Error = %@", error);
         }

     }];

编辑：超时问题仍然存在。我在didSendBodyData中记录了进度并识别出发送的字节数。不是全部，然后超时发生。使用curl，上传工作正常。

此外，我在日志中认识到一件事：当请求成功时，总字节数和预期字节数是相同的：

Total Bytes written: 161120
Expected Bytes to write: 161120

When the request failed:
Total Bytes written: 163840
Expected Bytes to write: 166839

还有其他想法吗？

- (void)post:(NSData*) requestBody {
    NSURL* serverURL = [NSURL URLWithString: @"https://mySpace.cloudant.com/myDb"];

    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:serverURL
                                             cachePolicy:NSURLRequestUseProtocolCachePolicy
                                         timeoutInterval:30.0];
    [request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
    [request setHTTPMethod:@"POST"];
    [request setHTTPBody:requestBody];

    NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
    [connection start];
}

#pragma mark -
#pragma mark Connection Delegates
- (void) connection:(NSURLConnection *)connection didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge
{
    if ([challenge previousFailureCount] == 0) {
        NSLog(@"received authentication challenge");
        NSURLCredential *newCredential = [NSURLCredential credentialWithUser:@"myUser"
                                                                    password:@"myPwd"
                                                                 persistence:NSURLCredentialPersistenceForSession];
        NSLog(@"credential created");
        [[challenge sender] useCredential:newCredential forAuthenticationChallenge:challenge];
        NSLog(@"responded to authentication challenge");
    }
    else {
        NSLog(@"previous authentication failure");
    }
}

Answer 1

这似乎是网址格式的问题。使用低级HTTP库时，必须手动添加基本身份验证标头 - NSURLConnection and Basic HTTP Authentication in iOS显示如何执行此操作。超时可能是由于设备试图联系无效主机。

您可以通过尝试使用curl直接发出请求来测试这一点，即：

curl -XPOST https://username.password@username.cloudant.com/db -H 'Content-Type:application/json' -d @test.json

其中test.json包含超时的JSON。

使用curl可以更容易地进行调试（您将看到原始响应），并确认它是服务器端问题还是特定于库的问题。

每个“POST”异步请求是否有任何文档大小限制？

1 个答案: