[英]How to get content type of a web address?
I want to get type of a web address. 我想获得一个网址类型。 For example this is a Html page and its page type is
text/html
but the type of this is text/xml
. 例如这是一个HTML页面,其页面类型为
text/html
,但类型这是text/xml
。 this page's type seems to be image/png
but it's text/html
. 这个页面的类型似乎是
image/png
但它是text/html
。
I want to know how can I detect the content type of a web address like this ? 我想知道我怎么可以检测如Web地址的内容类型此 ?
it should be something like this 它应该是这样的
var request = HttpWebRequest.Create("http://www.google.com") as HttpWebRequest;
if (request != null)
{
var response = request.GetResponse() as HttpWebResponse;
string contentType = "";
if (response != null)
contentType = response.ContentType;
}
HTTP Response header: content-type
HTTP响应标头:
content-type
For a more detailed response, please provide a more detailed question. 如需更详细的回复,请提供更详细的问题。
You can detect the Content-Type
by the Http header of the response,for http://bayanbox.ir/user/ahmadalli/images/div.png ,the header is 您可以通过响应的Http标头检测
Content-Type
,对于http://bayanbox.ir/user/ahmadalli/images/div.png ,标题是
Connection:keep-alive
Content-Encoding:gzip
Content-Type:text/html; charset=utf-8
Date:Tue, 14 Aug 2012 03:01:41 GMT
Server:bws
Transfer-Encoding:chunked
Vary:Accept-Encoding
Read up on HTTP headers. 阅读HTTP标头。
HTTP headers will tell you the content type. HTTP标头将告诉您内容类型。 For example:
例如:
content-type: application/xml.
content-type:application / xml。
There are two ways to determining the content-type 有两种方法可以确定内容类型
The first one was somewhat promoted by microsoft during to old days and is not a good practice anymore. 第一个是微软在过去的某种程度上推广的,并且不再是一个好的做法。
If the client has display constraints accepting only certain content-type, it would request the server with the headers like 如果客户端具有仅接受某种内容类型的显示约束,则它将向服务器请求标题
accept: application/json
accept: text/html
accept: application/xml
And then if the server could supply one of those and chooses XML it would return the content with the header 然后,如果服务器可以提供其中一个并选择XML,它将返回带有标头的内容
content-type: application/xml.
However, some services include further information like 但是,某些服务包括更多信息
content-type: application/xml; charset=utf-8
rather than using a header of its own for the character encoding. 而不是使用自己的标头进行字符编码。
using (MyClient client = new MyClient())
{
client.HeadOnly = true;
string uri = "http://www.google.com";
byte[] body = client.DownloadData(uri); // note should be 0-length
string type = client.ResponseHeaders["content-type"];
client.HeadOnly = false;
// check 'tis not binary... we'll use text/, but could
// check for text/html
if (type.StartsWith(@"text/"))
{
string text = client.DownloadString(uri);
Console.WriteLine(text);
}
}
Will get you the mime type from the headers without downloading the page. 无需下载页面即可从标题中获取mime类型。 Just look for the content-type in the response headers.
只需在响应标头中查找内容类型即可。
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