比如，添加对应的Referer，以便成功模拟网页逻辑，获得所需返回的内容的：

            string tmpRespHtml = "";
            Dictionary<string, string> headerDict;
            //(1)to get cookies
            string pageRankMainUrl = "http://pagerank.webmasterhome.cn/";
            tmpRespHtml = getUrlRespHtml(pageRankMainUrl);
            //(2)ask page rank
            string firstBaseUrl = "http://pagerank.webmasterhome.cn/?domain=";
            //http://pagerank.webmasterhome.cn/?domain=answers.yahoo.com
            string firstWholeUrl = firstBaseUrl + noHttpPreDomainUrl;
            headerDict = new Dictionary<string, string>();
            headerDict.Add("referer", pageRankMainUrl);
            tmpRespHtml = getUrlRespHtml(firstWholeUrl, headerDict: headerDict);

                

	header中的Referer支持大小写任意
	由具体的实现代码： string lowecaseHeader = header.ToLower(); // following are allow the caller overwrite the default header setting if (lowecaseHeader == "referer") { req.Referer = headerValue; } 可以看出，此处的"referer"，写成常见的首字母大写"Referer"也是可以的。

如第 9.6.2.2 节 “默认是允许自动跳转的”所述，默认是启用了自动跳转的，想要禁止自动跳转，可以通过header去设置：

    Dictionary<string, string> headerDict = new Dictionary<string, string>();
    headerDict.Add("AllowAutoRedirect", "false");
    string respHtml = getUrlRespHtml(yourUrl, headerDict: headerDict);

                

header中的AutoRedirect支持多种写法

由具体的实现代码： else if ( (lowecaseHeader == "allow-autoredirect") || (lowecaseHeader == "allowautoredirect") || (lowecaseHeader == "allow autoredirect") ) { bool isAllow = false; if (bool.TryParse(headerValue, out isAllow)) { req.AllowAutoRedirect = isAllow; } } 可以看出，此处的"AllowAutoRedirect"，写成别的形式，也是支持的，比如："allowautoredirect"，"allow-autoredirect", "Allow-Autoredirect"，"allow autoredirect"，"Allow Autoredirect"

此处默认的Accept是"*/*"，如果想要指定不同的类型，可以手动通过header去设置：

    Dictionary<string, string> headerDict = new Dictionary<string, string>();
    headerDict.Add("Accept", "text/html");
    string respHtml = getUrlRespHtml(yourUrl, headerDict: headerDict);

                

关于Accept更多可能的取值，自己参考官网的解释：14.1 Accept

	header中的Accept支持大小写任意
	由具体的实现代码： else if (lowecaseHeader == "accept") { req.Accept = headerValue; } 可以看出，此处的"Accept"，写成别的形式，也是支持的，比如："accept"

此处默认的KeepAlive是true的，如果不想继续保持连接，则可以通过header去禁止：

    Dictionary<string, string> headerDict = new Dictionary<string, string>();
    headerDict.Add("Keep-Alive", "false");
    string respHtml = getUrlRespHtml(yourUrl, headerDict: headerDict);

                

	header中的KeepAlive支持多种写法
	由具体的实现代码： else if ( (lowecaseHeader == "keep-alive") || (lowecaseHeader == "keepalive") || (lowecaseHeader == "keep alive") ) { bool isKeepAlive = false; if (bool.TryParse(headerValue, out isKeepAlive)) { req.KeepAlive = isKeepAlive; } } 可以看出，此处的"Keep-Alive"，写成别的形式，也是支持的，比如："keep-alive"，"keepalive"，"KeepAlive"，"keep alive"，"Keep Alive"

此处默认没有指定Accept-Language，有需要的话，可以去通过header设置：

    Dictionary<string, string> headerDict = new Dictionary<string, string>();
    headerDict.Add("Accept-Language", "en-US"); //"zh-CN"
    string respHtml = getUrlRespHtml(yourUrl, headerDict: headerDict);

                

关于Accept-Language更多可能的取值，自己参考官网的解释：14.4 Accept-Language

	header中的Accept-Language支持多种写法
	由具体的实现代码： else if ( (lowecaseHeader == "accept-language") || (lowecaseHeader == "acceptlanguage") || (lowecaseHeader == "accept language") ) { req.Headers["Accept-Language"] = headerValue; } 可以看出，此处的"Accept-Language"，写成别的形式，也是支持的，比如："accept-language"，"acceptlanguage"，"AcceptLanguage"，"accept language"，"Accept Language"

如第 9.6.2.1 节 “内部已默认指定了IE8的User-Agent”所述，我此处的getUrlRespHtml，默认添加的User-Agent是IE8的。

如果有需要，你可以自己换成别的，比如Firefox的User-Agent：

//Mozilla Firefox
const string constUserAgent_Firefox = "Mozilla/5.0 (Windows; U; Windows NT 6.1; rv:1.9.2.6) Gecko/20100625 Firefox/3.6.6";
Dictionary<string, string> headerDict = new Dictionary<string, string>();
headerDict.Add("User-Agent", constUserAgent_Firefox);
string respHtml = getUrlRespHtml(yourUrl, headerDict: headerDict);

                

其中，关于各种浏览器的User-Agent，你可以自己去网络上找到。也可以参考我代码中的值：

    //IE7
    const string constUserAgent_IE7_x64 = "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; WOW64; Trident/5.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; InfoPath.3; .NET4.0C; .NET4.0E)";
    //IE8
    const string constUserAgent_IE8_x64 = "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; WOW64; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; InfoPath.3; .NET4.0C; .NET4.0E";
    //IE9
    const string constUserAgent_IE9_x64 = "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0)"; // x64
    const string constUserAgent_IE9_x86 = "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0)"; // x86
    //Chrome
    const string constUserAgent_Chrome = "Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/533.4 (KHTML, like Gecko) Chrome/5.0.375.99 Safari/533.4";
    //Mozilla Firefox
    const string constUserAgent_Firefox = "Mozilla/5.0 (Windows; U; Windows NT 6.1; rv:1.9.2.6) Gecko/20100625 Firefox/3.6.6";

                

	header中的User-Agent支持多种写法
	由具体的实现代码： else if ( (lowecaseHeader == "user-agent") || (lowecaseHeader == "useragent") || (lowecaseHeader == "user agent") ) { req.UserAgent = headerValue; } 可以看出，此处的"User-Agent"，写成别的形式，也是支持的，比如："user-agent"，"user agent", "User Agent"，"UserAgent"，"useragent"

此处默认情况下，对于GET，没有指定ContentType，对于POST，已经指定了"application/x-www-form-urlencoded"。

如果你有别的特殊需求，需要设置ContentType的话，可以去通过header设置：

    Dictionary<string, string> headerDict = new Dictionary<string, string>();
    headerDict.Add("Content-Type", "text/plain");
    string respHtml = getUrlRespHtml(yourUrl, headerDict: headerDict);

                

关于Content-Type更多可能的取值，自己参考官网的解释：14.17 Content-Type

	header中的Content-Type支持多种写法
	由具体的实现代码： else if ( (lowecaseHeader == "content-type") || (lowecaseHeader == "contenttype") || (lowecaseHeader == "content type") ) { req.ContentType = headerValue; } 可以看出，此处的"Content-Type"，写成别的形式，也是支持的，比如："content-type"，"contenttype"，"ContentType"，"content type"，"Content Type"

在很多时候，都需要设置，某些其他的，非标准的，header信息，则也可以去通过header设置。

比如，之前折腾InsertSkydriveFiles时所用到的：

    string createFolerUrl = "https://skydrive.live.com/API/2/AddFolder?lct=1";
    
    Dictionary<string, string> headerDict = new Dictionary<string, string>();
    headerDict.Add("Accept", "application/json");
    headerDict.Add("Referer", constSkydriveUrl);
    headerDict.Add("Canary", gCanary);
    headerDict.Add("Appid", gAppid);
    headerDict.Add("X-Requested-With", "XMLHttpRequest");
    headerDict.Add("Cache-Control", "no-cache");

    string postDataStr = genCreateFolderPostData(folderName, parentId, cid);

    respJson = getUrlRespHtml(createFolerUrl, headerDict:headerDict, postDataStr:postDataStr);

                

	指定某些特定的header
	由具体的实现代码： else { req.Headers[header] = headerValue; } 可以看出，此处，不限制你所指定的，其他某些特殊的header，但是你自己要清楚，你设置的什么header，是用来干什么用的。

比如，之前折腾：第 9.11 节 “查找获得域名的Page Rank:getDomainPageRank”时所用到的：

    //Method 1: use http://www.pagerankme.com/
    queryUrl = "http://www.pagerankme.com/";
    postDict = new Dictionary<string, string>();
    postDict.Add("url", domainUrl);
    respHtml = getUrlRespHtml(queryUrl, postDict: postDict);

                

比如，之前折腾：DownloadSongtasteMusic时所用到的：

    const string stHtmlCharset = "GB18030";

    Dictionary<string, string> headerDict = new Dictionary<string, string>();
    headerDict.Add("x-requested-with", "XMLHttpRequest");
    // when click play
    // access http://songtaste.com/time.php, post data:
    //str=5bf271ccad05f95186be764f725e9aaf07e0c7791a89123a9addb2a239179e64c91834c698a9c5d82f1ced3fe51ffc51&sid=3015123&t=0
    Dictionary<string, string> postDict = new Dictionary<string, string>();
    postDict.Add("str", str);
    postDict.Add("sid", sid);
    postDict.Add("t", "0");
    string getRealAddrUrl = "http://songtaste.com/time.php";
    songInfo.realAddr = crl.getUrlRespHtml(getRealAddrUrl, headerDict:headerDict, postDict:postDict, charset:stHtmlCharset);

                

比如，之前折腾：【未解决】通过百度API上传单个文件出现403的错误时所遇到的就是，post数据是以换行符非分隔符的，所以就要去直接设置对应的postDataStr：

string[] token = respTokenJson.Split(',');
 
string tokenStr = token[2].Split(':')[1].Trim('"');
 
byte[] fileBytes = null;
string filename = "fileForUpload2.txt";
string fullFilePath = @"d:\" + filename;
using (FileStream fs = new FileStream(fullFilePath, FileMode.Open))
{
    fileBytes = new byte[fs.Length];
    fs.Read(fileBytes, 0, fileBytes.Length);
}
 
StringBuilder buffer = new StringBuilder();
char[] fileCh = new char[fileBytes.Length];
for (int i = 0; i < fileBytes.Length; i++)
    fileCh[i] = (char)fileBytes[i];
 
buffer.Append(fileCh);
//postDict = new Dictionary<string, string>();
//postDict.Add("file", buffer.ToString());
 
string postDataStr = buffer.ToString();
 
string uploadSingleFileUrl = "https://pcs.baidu.com/rest/2.0/pcs/file?";
Dictionary<string, string> queryParaDict = new Dictionary<string, string>();
queryParaDict.Add("method", "upload");
queryParaDict.Add("access_token", tokenStr);
queryParaDict.Add("path", "/apps/测试应用/" + filename);
uploadSingleFileUrl += crifanLib.quoteParas(queryParaDict);
 
curCookies = crifanLib.getCurCookies();
newCookies = new CookieCollection();
foreach (Cookie ck in curCookies)
{
    if (ck.Name == "BAIDUID" || ck.Name == "BDUSS")
    {
        ck.Domain = "pcs.baidu.com";
    }
 
    newCookies.Add(ck);
}
crifanLib.setCurCookies(newCookies);
 
string boundaryValue = "----WebKitFormBoundaryS0JIa4uHF7yHd8xJ";
string boundaryExpression = "boundary=" + boundaryValue;
 
headerDict = new Dictionary<string, string>();
headerDict.Add("Pragma", "no-cache");
headerDict.Add("Content-Type", "multipart/form-data;" + " " + boundaryExpression);
 
postDataStr = boundaryValue + "\r\n"
            + "Content-Disposition: form-data; name=\"file\"" + "\r\n"
            + postDataStr + "\r\n"
            + boundaryValue;
 
//string str = crifanLib.getUrlRespHtml(
//    string.Format(@"https://pcs.baidu.com/rest/2.0/pcs/file?method=upload&path=%2Fapps%2F%E6%B5%8B%E8%AF%95%E5%BA%94%E7%94%A8%2F78.jpg&access_token={0}", tokenStr),
//    headerDict, postDict);
string respJson = crifanLib.getUrlRespHtml(uploadSingleFileUrl, headerDict:headerDict, postDataStr: postDataStr);

                

比如，之前折腾：【记录】给BlogsToWordPress添加支持导出网易的心情随笔时所遇到的就是，post数据是以换行符非分隔符的，所以就要去直接设置对应的postDataStr：

    string postDataStr =
        "callCount=1" + "\r\n" +
        "scriptSessionId=${scriptSessionId}187" + "\r\n" +
        "c0-scriptName=BlogBeanNew" + "\r\n" +
        "c0-methodName=getBlogs" + "\r\n" +
        "c0-id=0" + "\r\n" +
        "c0-param0=" + "number:" + userId + "\r\n" +
        "c0-param1=" + "number:" + startBlogIdx + "\r\n" +
        "c0-param2=" + "number:" + onceGetNum;

    //http://api.blog.163.com/ni_chen/dwr/call/plaincall/BlogBeanNew.getBlogs.dwr
    string getBlogsDwrMainUrl = blogApi163 + "/" + blogUser + "/" + "dwr/call/plaincall/BlogBeanNew.getBlogs.dwr";
         
    Dictionary<string, string> headerDict = new Dictionary<string, string>();
    headerDict = new Dictionary<string, string>();
    //Referer    http://api.blog.163.com/crossdomain.html?t=20100205
    headerDict.Add("Referer", "http://api.blog.163.com/crossdomain.html?t=20100205");
    headerDict.Add("Content-Type", "text/plain");
    
    string blogsRespHtml = getUrlRespHtml(getBlogsDwrMainUrl, headerDict:headerDict, postDataStr:postDataStr);