NAME

TUWF::Response - Response generation methods for TUWF

DESCRIPTION

This module is used to generate a HTTP response. It is automatically loaded by TUWF and its methods can be used without requiring any special work.

This module can not be used outside of the TUWF framework.

METHODS

The following methods are added to the main TUWF object:

resInit()

Initializes or resets the response data. All headers, cookies and content will be reset to their defaults. This method is called at the start of each request by TUWF, but it can also be useful in your own code:

  # create a response, setting headers and content, etc...
  $self->resCookie(userid => $user);
  print { $self->resFd() } "Content!\n";
  
  # when you later decide that you actually wanted to create a totally
  # different response:
  $self->resInit();
  # ...after which you can start again

resHeader(name, value, add)

When only the name argument is present, returns the list of values of the named header in list context, or the first value in scalar context. An empty list or undef is returned if the named response header has not been set.

When name is given and value is undef, all set headers with that name will be removed from the response.

When name and value are both given, the named header will be set to the value, possibly overwriting an earlier header of the same name. When add is also given and set to a true value, the header will be added, without potentially overwriting a previous value.

The default header (as set by reqInit()) is:

  Content-Type: text/html; charset=UTF-8

A Content-Encoding header may be set by resBuffer(). A Content-Length header is added automatically when the response is sent. Set-Cookie headers set by resCookie() are not manipulated through this function.

TIP: When setting the Content-Type header to a textual type, do not forget to indicate that the charset is UTF-8.

resCookie(name, value, %options)

Add and manipulate Set-Cookie response headers. When only name is given or when value is undef, the named cookie will be removed. That is, there will be a Set-Cookie header telling the browser to remove the cookie. When value is also defined, the cookie will be set to that value, possibly overwriting a previous value. The following additional options are accepted:

expires

A UNIX timestamp indicating when this cookie should expire. A value before the current time() means the cookie should be immediately removed, which is equivalent to setting value to undef.

domain

The domain name for which this cookie should be used.

path

The absolute path for which this cookie should be present.

secure

Set to true to add the secure flag to the cookie. This means that the cookie will only be present if the client is connected through HTTPS.

httponly

Set to true to only allow the cookie to be read using HTTP. That is, disallow the cookie to be used within Javascript.

It is possible to set defaults for these options with the cookie_defaults setting.

resBuffer(action)

Reads or manipulates the output buffer and its encoding. action can be one of the following:

undef / empty string

Returns the currently used output encoding, which can be one of 'none', 'gzip' or 'deflate'.

clear

Clears the output buffer, but does not modify the output encoding.

none

Clears the output buffer and disables any output encoding. All data will be sent to the client as-is.

gzip

Clears the output buffer and enables gzip output compression. Requires PerlIO::gzip.

deflate

Same as gzip, but does not include the gzip header. (More correctly called 'zlib'). Requires PerlIO::gzip.

auto

Automatically detect which output encoding to use. If PerlIO::gzip is not installed, it will use 'none'. If it is, it will choose whatever the browser requested with the Accept-Encoding request header.

The Content-Encoding response header is automatically set to the correct value if compression is used. reqInit() automatically calls reqBuffer(). The default encoding can be set with the content_encoding setting.

Note that the :utf8 IO filter is always enabled, regardless of the encoding.

resFd()

Returns the filehandle of the output buffer. The :utf8 filter is enabled on this filehandle, meaning that everything you write to it should be in Perls native unicode format. It is a bad idea to use this filehandle for anything other than writing. It is important to remember that this filehandle writes to a buffer, and its contents will not be flushed before the request has been fully processed. Since resBuffer() creates a new filehandle each time it is called, the return value of resFd() is invalid after a call to resBuffer().

You rarely have to use this filehandle directly. TUWF::XML provides a more convenient set of functions, including lit(), which can be used to output raw text.

resStatus(code)

Gets or sets the numeric HTTP response status code.

resRedirect(location, type)

Generate a HTTP redirect to location, which should be a path relative to the domain, including leading a slash. If type is not defined, a 301 (Moved Permanently) is used. If type is 'temp', a 307 (Temporary Redirect) or if type is 'post' a 303 (See Other) status code is used. The latter is recommended for use as response to a POST request, as it explicitely tells the browser to use a GET request for the redirect.

resRedirect() calls resInit(), so if you wish to send any additional headers or cookies, you have to set these after calling resRedirect().

resNotFound()

Return a 404 Page Not Found response. The response will be exactly the same as the 404 response used when the path did not match any of the registered URI handles. This means the callback configured with error_404_handler will be called.

Important: Do NOT call this function from your error_404_handler function, this will cause infinite recursion!

SEE ALSO

TUWF

COPYRIGHT

Copyright (c) 2008-2017 Yoran Heling.

This module is part of the TUWF framework and is free software available under the liberal MIT license. See the COPYING file in the TUWF distribution for the details.

AUTHOR

Yoran Heling <projects@yorhel.nl>

cpanm TUWF

perl -MCPAN -e shell
install TUWF