.. _whatsnew_changes_7.4:
%%%%%%%%%%%%%%%%%%%%%%
Changes in Varnish 7.4
%%%%%%%%%%%%%%%%%%%%%%
For information about updating your current Varnish deployment to the
new version, see :ref:`whatsnew_upgrading_7.4`.
A more detailed and technical account of changes in Varnish, with
links to issues that have been fixed and pull requests that have been
merged, may be found in the `change log`_.
.. _change log: https://github.com/varnishcache/varnish-cache/blob/master/doc/changes.rst
varnishd
========
HTTP/2 header field validation is now more strict with respect to
allowed characters.
The :ref:`vcl-step(7)` manual page has been added to document the VCL
state machines.
VCL Tracing
~~~~~~~~~~~
VCL tracing now needs to be explicitly activated by setting the
``req.trace`` or ``bereq.trace`` VCL variables, which are initialized
from the ``feature +trace`` flag. Only if the trace variables are set
will ``VCL_trace`` log records be generated.
Consequently, ``VCL_trace`` has been removed from the default
``vsl_mask``, so any trace records will be emitted by
default. ``vsl_mask`` can still be used to filter ``VCL_trace``
records.
To trace ``vcl_init {}`` and ``vcl_fini {}``, set the ``feature
+trace`` flag while the vcl is loaded/discarded.
Parameters
~~~~~~~~~~
The ``startup_timeout`` parameter now specifically replaces
``cli_timeout`` for the initial startup only.
Changes to VCL
==============
The ``Content-Length`` and ``Transfer-Encoding`` headers are now
protected. For the common use case of ``unset
(be)req.http.Content-Length`` to dismiss a body, ``unset
(be)req.body`` should be used.
varnishlog
==========
Object creation failures by the selected storage engine are now logged
under the ``Error`` tag as ``Failed to create object from %s
%s``.
varnishadm
==========
Tabulation of the ``vcl.list`` CLI output has been modified slightly.
varnishstat
===========
The counter ``MAIN.http1_iovs_flush`` has been added to track the
number of premature ``writev()`` calls due to an insufficient number
of IO vectors. This number is configured through the ``http1_iovs``
parameter for client connections and implicitly defined by the amount
of free workspace for backend connections.
varnishtest
===========
The basename of the test directory is now available as the ``vtcid``
macro to serve as a unique string across concurrently running tests.
The ``varnishd_args_prepend`` and ``varnishd_args_append`` macros have
been added to allow addition of arguments to ``varnishd`` invocations
before and after those added by ``varnishtest`` by default.
``User-Agent`` request and ``Server`` response headers are now created
by default, containing the respective client and server name. The
``txreq -nouseragent`` and ``txresp -noserver`` options disable
addition of these headers.
Changes for developers and VMOD authors
=======================================
Call sites of VMOD functions and methods can now be restricted to
built-in subroutines using the ``$Restrict`` stanza in the VCC file.
``.vcc`` files of VMODs are now installed to
``/usr/share/varnish/vcc`` (or equivalent) to enable re-use by other
tools like code editors.
API Changes
~~~~~~~~~~~
The ``varnishapi`` version has been increased to 3.1 and the
``VSHA256_*``, ``VENC_Encode_Base64()`` and ``VENC_Decode_Base64()``
functions are now exposed.
In ``struct vsmwseg`` and ``struct vsm_fantom``, the ``class`` member
has been renamed to ``category``.
The ``VSB_quote_pfx()`` (and, consequently, ``VSB_quote()``) function
no longer produces ``\v`` for a vertical tab. This improves
compatibility with JSON.
Additions to varnish C header files
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The ``PTOK()`` macro has been added to ``vas.h`` to simplify error
checking of ``pthread_*`` POSIX functions.
The ``v_cold`` macro has been added to add ``__attribute__((cold))``
on compilers supporting it. It is used for ``VRT_fail()`` to mark
failure code paths as cold.
The utility macros ``ALLOC_OBJ_EXTRA()`` and ``ALLOC_FLEX_OBJ()`` have
been added to ``miniobj.h`` to simplify allocation of objects larger
than a struct and such with a flexible array.
*eof*
LIII "CAPTAIN, THEY'VE GOT US" The corner house, the mystery--everything was now forgotten. Bruce called for hot water, he made a sign for it, he simulated the mixing of mustard in a pot. Fortunately his companion's native intelligence was equal to the strain. She vanished with a quick nod of her head. Adirondack tents and pitch it on the campus. Larry¡¯s remembrance, a radium-dial wrist watch, and Dick¡¯s gift, the set of drawing implements he coveted, delighted him. Jeff¡¯s modest but earnestly presented ¡°luck charm¡± secured from his gypsy fortune teller was accepted with a grave, grateful word¡ªbut Sandy had hard work not to break into a wild laugh. By the light of the blazing pine, the Deacon pulled off the cedar boughs and developed his store. The boughs had kept in the heat, so that the food was not yet quite cold, though it had a resinous flavor, from its covering. The Deacon broke one of the cornpones in two and gave half of it to Shorty, with as much as he thought he should have of the meat and vegetables. Then he fed Si, who relished the new diet almost as much as he had relished the chicken broth. The Deacon made a hearty supper himself, and then stored away the rest in his "cellar" under the crib, rolling up some more large stones as an additional precaution. "No, Si," said Shorty, summoning all his resolution; "I'm goin' back on the next train. I must git back to the company. They'll¡ª" "Go out there, Alf, on the gravel, and sing to 'em," said Shorty. "Well, le's have a song, then," said Shorty, as Si was looking around. "Where's Alf Russell?" "Good morrow, holy father." "Woman!" interrupted De Boteler impatiently, "your son has answered for himself¡ªretire." HoME²¨¶àÒ°½áÒÂ×óÓÒ3D ftp
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