Android Code to Get HTTP Header Info of a Web Sites

Question

i am developing an android app wherein i need to GET HTTP headers of a website over my android activity, below cited link where i found a code but not getting all the headers.

http://www.mkyong.com/java/how-to-get-http-response-header-in-java/

i need results like shown in the below image

_{(source: osxdaily.com)}

please support.

Answer 1

Check out the java sample code that should work with android as well:

Method-1

URL url = new URL("http://www.google.com:80");
URLConnection conn = url.openConnection();

Map<String, List<String>> headerFields = conn.getHeaderFields();

Set<String> headerFieldsSet = headerFields.keySet();
Iterator<String> hearerFieldsIter = headerFieldsSet.iterator();

while (hearerFieldsIter.hasNext()) {

    String headerFieldKey = hearerFieldsIter.next();
    List<String> headerFieldValue = headerFields.get(headerFieldKey);

    StringBuilder sb = new StringBuilder();
    for (String value : headerFieldValue) {
        sb.append(value);
        sb.append("");
    }

    System.out.println(headerFieldKey + "=" + sb.toString());

}

Method-2 (Ref: Get headers from HttpClient in android)

HttpClient client = HttpClientBuilder.create().build();
HttpGet request = new HttpGet("http://mkyong.com");
HttpResponse response = client.execute(request);

//get all headers       
Header[] headers = response.getAllHeaders();
for (Header header : headers) {
    System.out.println("Key : " + header.getName() 
      + " ,Value : " + header.getValue());
}

//get header by 'key'
String server = response.getFirstHeader("Server").getValue();

Hope it will help you..

Answer 2

let say you have

HttpResponse response ;

then do.(for specific header)

Header[] headers = response.getHeaders("Server");
        if (headers.length > 0) {
            String value = headers[0].getValue();

and to retrieve all headers

Header[] headers = response.getAllHeaders();

for(int i =0 ; i<headers.length;i++)
{
System.out.println("header : "+i+" - > "+headers[i]);
}

Answer 3

Depending on http post or get you can use getAllHeaders or getHeaders method. Here is an example for http post.

HTTP POST method :

DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(URL);

first method :

public Header[] getAllHeaders () 
Added in API level 1
Returns all the headers of this message. Headers are orderd in the sequence they will be sent over a connection.

Returns
all the headers of this message 

second method description :

public Header[] getHeaders (String name) 
Added in API level 1
Returns all the headers with a specified name of this message. Header values are ignored. Headers are orderd in the sequence they will be sent over a connection.

Parameters
name  the name of the headers to return. 

Returns
the headers whose name property equals name. 

Answer 4

Try this:

1. HttpResponse response ; // http response

2. Get entity from the response

   final HttpEntity entity = response.getEntity();
   if(entity == null) {
       return;
   }
   

3. Get the Header object from the entity. Refer this

   final Header header = entity.getContentEncoding();
   if (header == null) {
       return;
   }
   

4. Get each header element Refer this

   for (HeaderElement h : header.getElements()) {
       if (h.getName().equalsIgnoreCase(HEADER_PARAMETER_VALUE)) {
           h.getValue();
           return;
       }
   }