HTTP Error 406 Not acceptable

Sabtu, 10-07-2010 07:02 WIB | diposting dari studio | hit: 262 | komentar: 0

Introduction

A client (e.g. your Web browser or our CheckUpDown robot) can
indicate to the Web server (running the Web site) the
characteristics of the
data it will accept back from the Web server. This is done using
'accept
headers' of the following types:

• Accept: The MIME types accepted by the client. For example, a
  browser may only accept back types of data (HTML files, GIF files
  etc.) it
  knows how to process.
• Accept-Charset: The character sets accepted by the client.
  
• Accept-Encoding: The data encoding accepted by the client
  e.g. the file formats it understands.
• Accept-Language: The natural languages (English, German etc.)
  accepted by the client.
• Accept-Ranges: Whether the client accepts ranges of bytes
  from the resource i.e. a portion of the resource.

If the Web server detects that the data it wants to return is
not acceptable to the client, it returns a header containing the
406 error
code.

406 errors in the HTTP cycle

Any client (e.g. your Web browser or our CheckUpDown robot) goes
through the following cycle:

• Obtain an IP address from the IP name of the site (the site
  URL without the leading 'http://'). This lookup (conversion of IP
  name to IP
  address) is provided by domain name servers (DNSs).
• Open an IP socket connection to that IP address.
• Write an HTTP data stream through that socket.
• Receive an HTTP data stream back from the Web server in
  response. This data stream contains status codes whose values are
  determined by
  the HTTP protocol. Parse this data stream for status codes and
  other useful
  information.

This error occurs in the final step above when the client
receives an HTTP status code that it recognises as '406'.

Fixing 406 errors - general

This error occurs very infrequently in Web browsers, because
most browsers will accept any data returned from the Web
server.

If the client is not a Web browser, then anyone can only
investigate the problem by looking at the Accept headers generated
by the
client system and the data stream returned by the Web server. If
you do not
have access to the source code for these systems, the only thing
you can do is
refer the problem to technical support people at the companies
that developed
the systems.

Fixing 406 errors - CheckUpDown

This error should simply never occur in your CheckUpDown
account. If it does, it typically indicates defective programming
of our
systems or of the Web server which manages the site. We do not use
accept
headers at all, so there is no reason for the Web server to
generate a 406
error.

Please contact us (email preferred) whenever you encounter 406
errors - there is nothing you can do to sort them out. We then
have to liaise
with your ISP and the vendor of the Web server software to agree
the exact
reason for the error.

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