JS通过服务代理调用跨域服务
这里讲的是服务代理,应用情景如下:
A站点有一个JS脚本需要调用B站点的服务接口,但是A站点和B站点不是同一个域名下,这样就关系到跨域访问的了问题了,一种解决方法是通过一个代理去接管所有对B站点服务的调用。
服务器端:AcrossServer.ashx
当然,我们可以对Post操作进一步封装到一个方法
PostRequest
A站点有一个JS脚本需要调用B站点的服务接口,但是A站点和B站点不是同一个域名下,这样就关系到跨域访问的了问题了,一种解决方法是通过一个代理去接管所有对B站点服务的调用。
服务器端:AcrossServer.ashx
public class AcrossServer : IHttpHandler {
public void ProcessRequest (HttpContext context) {
context.Response.ContentType = "text/plain";
string clientKey = context.Request["ClientKey"];
string clientIP = context.Request["ClientIP"];
context.Response.Write(string.Format("AcrossServer:ClientKey={0}, ClientIP={1}", clientKey, clientIP));
}
}
代理服务:public void ProcessRequest (HttpContext context) {
context.Response.ContentType = "text/plain";
string clientKey = context.Request["ClientKey"];
string clientIP = context.Request["ClientIP"];
context.Response.Write(string.Format("AcrossServer:ClientKey={0}, ClientIP={1}", clientKey, clientIP));
}
}
public class AcrossClient : IHttpHandler {
public void ProcessRequest (HttpContext context) {
context.Response.ContentType = "text/plain";
//构造Post数据
string clientKey = "af8b908b-7735-4db6-9d8f-eef05b2eef69";
string clientIP = context.Request.UserHostAddress;
StringBuilder sb = new StringBuilder();
sb.AppendFormat("ClientKey={0}&ClientIP={1}", clientKey, clientIP);
foreach (string key in context.Request.Form.AllKeys)
{
sb.AppendFormat("&{0}={1}", key, context.Request.Form[key]);
}
string postData = sb.ToString();
byte[] data = Encoding.UTF8.GetBytes(postData);
//HttpWebRequest
string url = string.Format("http://my2.csdn.net/Samples/CJB3/AcrossServer.ashx");
HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url);
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
request.ContentLength = data.Length;
request.Timeout = 10000;//10s
string content = string.Empty;
try
{
//把postdata写入HttpWebRequest
using (Stream requestStream = request.GetRequestStream())
{
requestStream.Write(data, 0, data.Length);
requestStream.Close();
}
//获取HttpWebResponse
using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
{
if (response.StatusCode == HttpStatusCode.OK)
{
using (Stream stream = response.GetResponseStream())
{
using (StreamReader reader = new StreamReader(stream, Encoding.UTF8))
{
content = reader.ReadToEnd();
reader.Close();
}
stream.Close();
}
}
response.Close();
}
}
catch (System.Net.WebException)
{
//TODO:考虑在此添加超时异常的日志
}
finally
{
if (request != null)
{
request.Abort();
request = null;
}
}
context.Response.Write(string.Format("AcrossClient=>{0}", content));
}
}
我们通过在代理端重新封装所有的Post数据并且添加新的服务验证等数据一起Post到真正的服务接口,最后把调用的返回也返回给代理调用方。 public void ProcessRequest (HttpContext context) {
context.Response.ContentType = "text/plain";
//构造Post数据
string clientKey = "af8b908b-7735-4db6-9d8f-eef05b2eef69";
string clientIP = context.Request.UserHostAddress;
StringBuilder sb = new StringBuilder();
sb.AppendFormat("ClientKey={0}&ClientIP={1}", clientKey, clientIP);
foreach (string key in context.Request.Form.AllKeys)
{
sb.AppendFormat("&{0}={1}", key, context.Request.Form[key]);
}
string postData = sb.ToString();
byte[] data = Encoding.UTF8.GetBytes(postData);
//HttpWebRequest
string url = string.Format("http://my2.csdn.net/Samples/CJB3/AcrossServer.ashx");
HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url);
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
request.ContentLength = data.Length;
request.Timeout = 10000;//10s
string content = string.Empty;
try
{
//把postdata写入HttpWebRequest
using (Stream requestStream = request.GetRequestStream())
{
requestStream.Write(data, 0, data.Length);
requestStream.Close();
}
//获取HttpWebResponse
using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
{
if (response.StatusCode == HttpStatusCode.OK)
{
using (Stream stream = response.GetResponseStream())
{
using (StreamReader reader = new StreamReader(stream, Encoding.UTF8))
{
content = reader.ReadToEnd();
reader.Close();
}
stream.Close();
}
}
response.Close();
}
}
catch (System.Net.WebException)
{
//TODO:考虑在此添加超时异常的日志
}
finally
{
if (request != null)
{
request.Abort();
request = null;
}
}
context.Response.Write(string.Format("AcrossClient=>{0}", content));
}
}
当然,我们可以对Post操作进一步封装到一个方法
![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)