我试图通过 Apple CFNetwork 框架使用持久的 HTTP 连接来减少我们的服务器开销。但是,关于它的文档很少。我能找到的唯一信息表明,只要设置了适当的标志,框架就会代表开发人员回收流:
CFHTTPMessageRef request = CFHTTPMessageCreateRequest(kCFAllocatorDefault, methodString, url, kCFHTTPVersion1_1);
CFHTTPMessageSetHeaderFieldValue(request, CFSTR("Keep-Alive"), CFSTR("120")); <--- This line
//Set message body if we're posting
if (msDetails.eType == HttpRequestDetails::POST)
{
CFDataRef bodyRef = CFDataCreate(kCFAllocatorDefault, (const UInt8*)msDetails.strBody.c_str(), msDetails.strBody.length());
CFHTTPMessageSetBody(request, bodyRef);
CFRelease(bodyRef);
}
//Create the read stream...
CFReadStreamRef ReadStream = CFReadStreamCreateForHTTPRequest(kCFAllocatorDefault, request);
//...use persistent connections..
CFReadStreamSetProperty(ReadStream, kCFStreamPropertyHTTPAttemptPersistentConnection, kCFBooleanTrue); <--- This line
//...enable SSL if the URL is https
if(msDetails.strURL[4] == 's')
{
//Hey an https request
CFMutableDictionaryRef pDict = CFDictionaryCreateMutable(kCFAllocatorDefault, 2, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
CFDictionarySetValue(pDict, kCFStreamSSLValidatesCertificateChain, kCFBooleanFalse);
CFDictionarySetValue(pDict, kCFStreamPropertySocketSecurityLevel, kCFStreamSocketSecurityLevelSSLv3);
CFReadStreamSetProperty(ReadStream, kCFStreamPropertySSLSettings, pDict);
CFRelease(pDict);
}
CFReadStreamOpen(ReadStream);
上面的代码会导致“CFNetwork 内部错误”。如果我删除 CFReadStreamSetProperty(ReadStream, kCFStreamPropertyHTTPAttemptPersistentConnection, kCFBooleanTrue) 调用,那么我不再收到错误。还值得一提的是,我在读完数据后关闭了 readstream,但也许我需要自己管理流池?
有没有人可以参考我的任何文档、示例或教程?我热衷于继续使用 CFNetwork 的东西,因为我们有一个客户坚持我们必须尽量减少对 Obj-C 的使用。