JSP and JSTL Tutorials - Tutorial Addendum - Authoritative HTTP Acknowledgment Attack Curve

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2. Acknowledgment attack lines: Advice about the response:

    

 

    
   Accept-Ranges     

    
   Age               

    
   ETag              

    
   Area          

    
   Proxy-Authenticate

    
   Retry-After       

    
   Server            

    
   Alter              

    
   WWW-Authenticate

    

3. Article attack lines: Advice about the data requested by the client:

    

 

    
   Acquiesce              

    
   Content-Encoding   

    
   Content-Language   

    
   Content-Length     

    
   Content-Location   

    
   Content-MD5        

    
   Content-Range      

    
   Content-Type       

    
   Expires            

    
   Last-Modified      

    

Controlling Attack Lines

    

When a PHP page is requested, the acknowledgment attack curve will be created by the

    

PHP engine. But you can ascendancy all attack curve with the header() function. Here

    

are rules and syntax of the header() function:

    

1. The syntax of header() is:

    

 

    
void header(string header_line[, bool replace[, int http_response_code]])

    

2. "header_line" specifies a complete attack band cord like "Content-Type: text/html".

    

3. "replace" can be acclimated to alter a ahead authentic attack band of the aforementioned identifier.

    

Default is replacing.

    

4. "header_line" can be acclimated to set the HTTP acknowledgment cachet band like "HTTP/1.1 200 OK".

    

5. header() haveto be alleged afore any achievement to the article body, if the achievement buffering is angry off.

    

6. If header() is alleged to set "Location" attack line, the cachet band will be set to "HTTP/1.0 302".

    

7. If header() is alleged assorted times, the cachet band will be consistently outputted first. Additional attack

    

lines will be outputted in aforementioned adjustment as their calling statements.

    

Viewing Attack Curve

    

When the applicant program receives the HTTP response, it will attending at the attack lines

    

first. Based on the advice independent in the attack lines, the applicant program will

    

decide what to do with the absolute acknowledgment data in the article body.

    

If you use a Web browser as a HTTP applicant program, it will action the data

    

in the article physique abnormally depending on mainly the "Content-Type" article attack line:

    

displaying the data as it is,

    

rendering the data as a HTML certificate and announcement the consistent information,

    

or casual the data to additional registered programs to handle it.

    

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cket(host,port);

    

BufferedWriter w = new BufferedWriter(new OutputStreamWriter(

    

c.getOutputStream()));

    

BufferedReader r = new BufferedReader(new InputStreamReader(

    

c.getInputStream()));

    

Cord m = "GET "+ aisle + " HTTP/1.0";

    

w.write(m,0,m.length());

    

w.newLine();

    

w.newLine();

    

w.flush();

    

while ((m=r.readLine())!= null) {

    

System.out.println(m);

    

}

    

w.close();

    

r.close();

    

c.close();

    

} bolt (IOException e) {

    

System.err.println(e.toString());

    

}

    

}

    

}

    

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