Annotation of /hydra/ChangeLog

** Changes from 0.1.1 to 0.1.2 - 
 * Allow running the server as root, if explicitly stated in
   configuration file.
 * Better pthreads detection.
 * Outputs to error log if non executable CGIs are found.
 * Does not close HTTP/1.1 connections by default.

** Changes from 0.1.0 to 0.1.1 - 17/12/2002
 * Corrected bug in Keep-Alive mode when SSL or TLS was enabled.
 * Fixed unexpected timeout in first connection on an idle server.

** Changes from 0.0.10 to 0.1.0 - 16/11/2002
 * No changes. This is the final release by me --Nikos

** Changes from 0.0.9 to 0.0.10 - 08/11/2002
 * Corrected bug in error logging.
 * Use the TMPDIR environment variable instead of TMP to get
   the temporary directory.

** Changes from 0.0.8 to 0.0.9 - 27/10/2002
 * Long offsets are not used by default.
 * Use of pipes instead of temporary files, if the post data sent
   are less than PIPE_BUF.
 * More consistent logging. The server's hostname or "unknown"
   are prepended to the log message.
 * Corrected redirection/aliases behaviour, to match the documented one.
 * SSLParamsRefresh was renamed to MaintenanceInterval and is more
   generic, since it includes some server cleanups.
 * Added file access control lists per virtual host. Based on patch for 
   Boa by Peter Korsgaard <jacmet@sunsite.dk>
 * Added the ability to disable HIC threads by using 0 in the
   HICThreads configuration directive.
 * Hydra now uses poll by default. Select is available using the --with-select
   configure option.

** Changes from 0.0.7 to 0.0.8 - 25/10/2002
 * Better pthread detection.
 * Better detection of dlopen call.
 * Some changes to compile in gcc 2.95
 * Added support for FreeBSD's sendfile (untested).
[Ported from Boa 0.94.14rc1]
 * add new state, IOSHUFFLE, which utilizes sendfile (or
   emulates it using the request's buffer, otherwise)
 * make the default socket size 32K.  The client_stream_size stays constant
   at 8K, and the new 'buffer' size is 4K
   Note also that the new code uses the "default" socket buffer size
   it obtains with the first accept()ed socket.
 * make default behavior be to leave stderr alone, but tie it
   to cgilog otherwise
 * add [optional, Linux-only] check for sendfile system call
 * use --disable-sendfile to disable sendfile support
   sendfile support for files > 100K is default, now. 
   It's significantly faster and easier than the alternative
 * umask ~0770 before exec
 * tie stdout to the access_log, unless there is no access_log,
   in which case tie it to /dev/null
 * use sensible defaults for umask (077) and (027 for CGI)
 * add and document new parameters (CGILog and CGIumask)
 * vast improvements to the cgi-test.cgi program, by Jon Nelson
   and Landon Curt Noll.
 * next 3 items by Don Mahurin (patches modified somewhat):
 * pidfile patch
 * default mime_types patch
 * NCSA environment environment variables wrapped in 
   #ifdef USE_NCSA_CGI_ENV
 * fix some escaping issues with the directory indexer
   (Ulf Harnhammar)
 * backport poll support from 0.95

** Changes from 0.0.6 to 0.0.7 - 10/10/2002
 * Added support for large files in 32 bit systems.
 * Added support for SSL_* variables in CGIs.
 * Added options in configuration file, to request and verify
   a client certificate.
 * The headers of HIC-CGIs are now parsed by the server.
 * Corrected behavour in SIGHUP signal handling, to reread 
   the SSL related variables.
 * Children and HIC threads are now killed using a signal, to avoid
   unexpected errors, and memory leaks.

** Changes from 0.0.5 to 0.0.6 - 03/10/2002
 * Compatibility functions are now automatically included in hydra, if
   they are not found by the configure script.
 * Replaced the included scandir function, with the one in libc.
 * Fixed code, which compiled fine with gcc 3.2, but didn't compile at
   all, with any other compiler!
 * Improved the MaxConnections directive semantics.
 * Added a very primitive mime.types file in examples/ directory.

** Changes from 0.0.4 to 0.0.5 - 02/10/2002
 * If a requested CGI is not accesible then send 404 not found, instead
   of trying to execute it.
 * Corrected several stuff in HIC CGI handler. This allows Cookies,
   POST data and Queries to work properly.

** Changes from 0.0.3 to 0.0.4 - 30/09/2002
 * Added support for If-Range, If-Match, If-None-Match HTTP/1.1 header
   fields. The server also generates ETag headers for static content using 
   the last modified field of the file, and the file size. This makes
   Hydra cache friendly.
 * Added support for multiple HIC threads. This gives a boost to script generation
   since they are no longer generated sequentially.

** Changes from 0.0.2 to 0.0.3 - 28/09/2002
 * Added support for dynamic modules that handle CGIs
   internally (HIC). That way Hydra can run PHP.
 * Fixes in CGI execution. CGIs that are not passed from aliasing
   functions now properly set PATH_INFO and PATH_TRANSLATED.
   (Needs further cleanup).
 * Cleaned up SSL support. Now hydra can be compiled even if gnutls
   is not available.

** Changes from Boa/0.94.13 to Hydra/0.0.2 - 26/09/2002
 * Added support for SSL 3.0 and TLS 1.0 protocols.
 * Added support for multiple CPU's by making the server
   run over a pool of threads.
 * Changed the file caching code. The mmap() calls are cached until
   the mmap list table is full.
 * Added support for HTTP/1.1 ranges.
 * Added support for hostname based virtual hosting.
   Also changed the semantics of Alias, ScriptAlias and Redirect, to
   take advantage of the host based virtual hosting.
 * Added support for the TCP_CORK tcp option in linux.
 * Cleaned up the CGI handling (gunzip, indexer are treated as CGIs)
 * Enhanced grammar to handle 3 and 4 argument options.
 * Added support for multiple directory indexes.
 * Dropped support for gunzip.
 * Use automake to create the distribution.

** Changes from 0.94.12 to 0.94.13
 * Change many instances of log_error_mesg + exit to DIE macro
 * Change all instance of log_error_mesg (without exit) to WARN macro
 * do a much better job of checking return values from malloc and
   especially strdup.
 * check results of calling umask and getrlimit
 * server_s is no longer a global int
 * check results of fork via switch instead of if (fork())
 * check for getopt.h and include it if found
 * remove unused #defines, and add WARN macro, and replace
   many calls to log_error_mesg(..) with WARN macro
 * fix bug in get_commonlog_time where time_offset calculation was
   the opposite of what it should be ('-' and '+' were swapped)
 * fix compatability bug with old and newer versions of flex/yacc
 * add check for AC_FUNC_MMAP to configure.in
 * fix really lame thinko in normalize_path, which would prepend the 
   results of earlier calls to results from later calls
 * Add MaxConnections, a configuration directive which allows the
   user to specify the maximum number of connections that Boa will
   accept concurrently.
 * add SERVER_ADDR and REQUEST_URI to environment of CGI
 * handle SIGBUS during writes of data that has been memory mapped
 * minor optimization in select.c that prevents DEAD requests from 
   being added to the block set
 * fix bug in CGI environment script_name - closes sf.net bug #576725
 * make 'status' variable local to requests.c, not local to every file
   by forgetting to declare 'extern' in globals.h :-|
 * make getsockname non-fatal, and do it every time because we may 
   need it for the CGI
 * some minor refactoring optimizations in hash.c
 
** Changes from 0.94.11 to 0.94.12
 * Renamed Changelog ChangeLog, and moved up to top-level directory
 * Next 3 items due in part or whole thanks to 
   Liam Widdowson
 * when printf'ing a pid type, force to int, because it could be 
   something else on other platforms.  Should probably change it to 
   a long, and use that.
 * backported chroot commandline support from 0.95
 * backported support for strdup, strstr, alphasort, and scandir
   from 0.95 
 * Fixed src/Makefile.in -- it didn't remove index_dir.o
 * backport create_temporary_file from 0.95
   (instead of using tmpnam)
 * Allow non-standard date format 31 September 2000 23:59:59 GMT
   Patch by Landon Curt Noll
 * Skip whitespace before HTTP/major.minor
   Adapted patch from Landon Curt Noll
 * open /dev/null first thing (affects chrooting)
 * properly handle sigalrm -- use sigalrm_flag and sigalrm_run
   instead of handling the signal in the signal handler
 * update manpage slightly
 * send 400 BAD Request when resource does not start with '/'
 * add grp.h to boa.h's includes -- remove from boa.c and config.c
 * removed duplicate header includes from boa.c, config.c, get.c, 
   ip.c, request.c, response.c
 * factor out creating the server socket and dropping privs
   into create_server_socket and drop_privs
 * type all functions in boa.c (except main) as static
 * set umask after opening /dev/null
 * tie stdin/stdout to /dev/null before commandline parse
 * removed old, unused chroot code
 * move builds_needs_escape earlier in the startup
 * move fork later in the startup
 * type all c_set_* as static in config.c
 * don't bother trying to change uid/gid (or error if the
   requested uid/gid doesn't exist) if not UID 0
 * return more appropriate error code when foo.html gives
   access denied, but foo.html.gz gives some other error
   (essentially report error associated with foo.html, not foo.html.gz)
 * send NOT Implemented when an unknown method is attempted
 * always attempt a 32k read right before close
   (stopgap until blackhole can be merged)
 * allow more than 1 space in logline between method, resource, 
   and http version
 * don't use inline functions
 * update configure.in so that autoconf 2.50 doesn't complain (as much)
 * properly use VPATH and srcdir according to autoconf docs
 * change curly-braces to parentheses in Makefilein
 * use $^ instead of manually listing the dependencies in Makefile.in
 * remove tests section in Makefile.in
 * write tags not TAGS in Makefile.in
 * Add gethostbyname and inet_aton to function checks
 * Add code from 0.95 which checks for socket in -lsocket, 
   inet_aton in -lresolv, and gethost{by}name in -lnsl
 * Also remove broken bc-based "how big is an unsigned int" checks:
   assume minimum of 32 bits and check in escape.c at runtime.
 * Added new file: README.chroot.solaris, based on a
   modified version by Liam Widdowson
 * Add check_struct_for.m4, which allows us to check a structure 
   for a member (found at http://www.gnu.org/software/ac-archive/
    authored by Wes Hardaker
 * Call "aclocal -I ." to rebuild aclocal.m4
 * Using new check-struct-for-member autoconf macro, check
   for tm_gmtoff and tm_zone in struct tm -- useful in
   portability tests for localtime.
 * Also check sockaddr_in for structure sin_len so we can set
   it properly.
 * index_dir.c (which ends up in boa_indexer) can now be compiled
   with USE_LOCALTIME, and if so, it will report the local time 
   using the timezone name. Otherwise it uses UTC time and UTC
   timezone designation.
 * fix buglet in mmap_cache.c which shows up when under
   heavy load by many different files.
   Found and squashed by Michal Kara
 * normalize paths on Aliases, log files, server root, dirmaker
   This makes sure that paths are 'absolute'
 * don't generate DOCUMENT_ROOT or SERVER_ROOT,
   CGIs have no business knowing that information
 * if CGI, chdir to the cgi's root path
   Bug found by Matt Callaway
 * remove ChrootPath and PidFile directives from the parser
   (they aren't used anyway)
 * keep track of maximum file descriptor in use to optimize call
   to select()
 * apply IPv6 patch from Jari Korva
 * optimize keep-alive copy data routine
 * try to use memcpy instead of strcpy/strcat in more places (alias.c)
 * update .depend file
 * use fcntl + GET_FL to get a file descriptor's flags, then
   add or remove only the bits we want to set. This prevents
   accidentally setting or unsettings bits we don't have anything
   to do with inadvertantly. (removed, at least temporarily.
   Show me a system where it is needed -- LRD)
 * make sure to call FD_ZERO when we handle a restart
 * in read.c, don't call boa_perror on read failure -- socket is
   dead or messed up anyway, no reason to try to write to it.
 * explicit .SUFFIXES in Makefile.in
 * boa.objdump target added
 * use @MAKE_SET@ (for when $(MAKE) != "make")
 * add  -Wundef -Wwrite-strings -Wredundant-decls -Winline to GCC_FLAGS
 * change Paul Phillips' and Larry Doolittle's emails in source
 * add --disable-debug, --enable-profile, --with-dmalloc, and --with-efence
 * test for failed-but-return-was-successful setuid:
   http://www.securityfocus.com/bid/1322
 * use _exit not exit in CGI child
 * always place new keepalive request on blocked list, we can't be
   sure of the state of the active list, and since enqueue places
   things at the *front* of the list, it doesn't do us much good
   to place the new request on the active list anyway.
 * update some Copyright statements for 2002
 * When comparing the uri to an alias, only compare if
   the uri length is greater than or equal to the length of the alias
 * in init_script_alias, make sure to check for document_root before
   trying to use it
 * script_name is now just a copy of the request, rather
   than some complicated variation on the pathname
 * change the way the CGI environment is handled.
   Now, it is allocated at request allocation time, and exists
   throughout the life of the structure.
 * check memory allocations, etc.. when creating the static
   CGI environment and when making new CGI environment variables
 * wait until process_option_end to call unescape_uri, clean_pathname,
   and translate_uri
 * remove debian package information
 * move RedHat packaging information to contrib
 * remove tests -- they weren't usable anyway
 * add some new hash routines, and use djb2 (a variant on a
   hash algorithm popularized by Dan J. Bernstein)
 * a side-effect of the new hash routines is a bugfix,
   involving negative return values from hash routines.
   This has been fixed.
 * add a routine, show_hash_stats, which is called with other
   statistical output via sigalarm
 * remove some duplicate prototypes from config.c
 * make simple_itoa take an unsigned int
 * try to make NOBLOCK handling in compat.h compatible with Solaris
 * make sure to update current_time before calling signal handlers
 * alter primary loop to make sure that select gets called even
   when there are requests that are not blocking, and call fdset_update
   and process_requests (when appropriate) after signal handlers but
   before select to make sure that blocked requests are still handled
   by select after a sighup. (Thanks to Karl Olsen)
 * pull select loop into select.c
 * poll server socket once per active connection
 * add send_r_service_unavailable and use it when appropriate
 * state uptime in seconds at normal program termination 
 * include sys/fcntl.h if it is found by configure
 * fix POST bug where a content-length < 0 would cause Boa to 
   consume its full share of CPU until killed
   Bug report by Landon Curt Noll
 * add CGIPath configuration variable
   based upon a patch by Landon Curt Noll
 * add function boa_atoi, which wraps atoi, but does not
   accept negative values. Additionally, it checks to make sure
   the converted value and the original value are the same, avoiding
   issues like "124.3" -> "123" and "123abc" -=> "123".
   Either a value is an int or it isn't - no middle ground.
 * use boa_atoi to convert content-length from client.
 * add new #define - SINGLE_POST_LIMIT_DEFAULT, which defines
   (in bytes) the *default* single_post_limit.
 * single_post_limit is now in bytes.
 * when adding aliases, only "normalize" paths that start
   with "./" - this is a departure from previous behavior
 * add "?" to the list of characters that it is safe to leave unescaped
 * clean up Makefile.in of no-longer-pertinent comments
 * add send_r_bad_gateway and use it
 * tie stderr to either cgi_log_fd or devnullfd - either way 
   make sure stderr is a valid filehandle before cgi execution
 * cgi_env is no longer allocated, it's part of the struct now
 * fix bug in CgiPath logic
 * when unable to allocate memory for an environment variable, log it
 * add clear_common_env, which de-allocates the cgi_common_env stuff
   [NEVER USE THIS outside of a terminal signal handler!]
 * don't be so wasteful of memory in normalize_path
 * adapted fix for alias expansion from Brieuc Jeunhomme

** Changes from 0.94.10.1 to 0.94.11
 * use LIBS in Makefile.in (which propagates from autoconf)
 * properly free memory allocated by scandir in index_dir.c
 * rearrange some header files and includes
 * on reads and writes, don't check for -1, check for < 0
 * include fix by William Meadows
   for escape.c which fixes segfaults due to improper allocation
 * above fix by William Meadows no longer needed;
   escape.c and escape.h rewritten by Larry Doolittle -- requires
   at least 32 bit words, but is correct (jdn's 1st attempt was faulty)

** Changes from 0.94.10 to 0.94.10.1
 * Actually update the SERVER_VERSION in src/defines.h

** Changes from 0.94.9 to 0.94.10
 * Fixes escaping rules
 * Fixes segfault when directory_index is undefined and
   directory needs to be generated
 * adds dummy signal handlers for SIGUSR1 and SIGUSR2 (Closes SF #425921)
 * Update documentation regarding mime.types (Closes Debian #69991)
 * Make sure documentation builds (Closes Debian #110818)

** Changes from 0.94.8.3 to 0.94.9
 * src/Makefile.in updated to take CFLAGS, LIBS, and LDFLAGS 
   from autoconf
 * Update escaping rules with latest RFC
 * unescape_uri skips fragments and also stop parsing at '?'
 * Don't accept fd over FD_SETSIZE in request.c:get_request
 * use backported documentation from 0.95
 * make sure POST fd gets closed even on client cancel
 * use backported index_dir.c from 0.95
 * support subdirectories in ScriptAlias directories
 * add SinglePostLimit (int, in Kilobytes) to config system
 * check for ENOSPC on body write
 * use environment variable TMP (or "/tmp" if not available),
   and chdir there when boa exits.
 * add 1-time-only hack to make a 32kB read at the end of a request
   on POST or PUT
 * close unused file descriptors (/dev/null in boa.c, and the 
   unused part of the pipes call in cgi.c)
 * made Makefile.in VPATH happy

** Changes from 0.94.8.2 to 0.94.8.3
 * Move unescape_uri *before* clean_pathname to prevent
   encoding of / and .. in pathname
 * wrap execution of GUNZIP in cgi.c with #ifdef GUNZIP
 * stop parsing when fragment found in URL ('#')

** Changes from 0.94.8.1 to 0.94.8.2
 * close pipes[1] in child and generate HTTP_REFERER environment 
   variable in cgi.c
 * Minor changes to the Debian package

** Changes from 0.94.8 to 0.94.8.1
 * Change umask call from (umask(0600)) to (umask(~0600))

** Changes from 0.94.7 to 0.94.8 
 * Fix major thinko in temp file permissions
 * unlink temporary file immediately following creation
 * implement maximum # of active connections at 10 less than RLIMIT_NOFILE
   to avoid or eliminate crashes resulting from running out of 
   file descriptors
 * Fix thinko in POST
 
** Changes from 0.94.6 to 0.94.7
 * STDIN and STDOUT are now tied to /dev/null
 * sets PATH_MAX to 2048 if not defined (for Hurd)
 * core dumps (should never happen) would be located in /tmp
 * alter behavior when select gets a EBADF
 * add translation for the \" char -> &quot;
 * remove use of sys_errlist.  Use perror.
 * better makedist.sh (still a stupid program though)

** Changes from 0.94.5 to 0.94.6
 * Removed doc++ commenting
 * Removed erroneous debugging statments
 * Move some stuff out of config.c (read_config_file) to boa.c
 * Altered some of fixup_server_root()
 * Bug fix in get.c re: automatic gunzip
 * Added some stubs for chroot code (*not* ready yet)

** Changes from 0.94.4 to 0.94.5
 * Alteration of most of the comments and such for doc++ use
 * Fixed buffer overflow in alias.c
 * Fixed buffer underflow in util.c

** Changes from 0.94.3 to 0.94.4
 * Better escaping of data to user, both for HTTP headers and HTML body
 * Proper escaping of output in CGI example perl scripts

** Changes from 0.94.0 to 0.94.2
 * Fixed obnoxious pipeline bug
 * Fixed (sorta) a compilation/core bug for *BSD systems 
   Original code by Thomas Neumann
 * Moved to GPLv2
 * Changed manpage to section 8
 * boa.sgml now references a .png file instead of evil .gif

** Changes from 0.93.19.2 to 0.94.0
 * Added UseGMT to the configuration parser
 * util.c commonlog now logs in Apache-style commonlog time format
 * Remove SO_SNDBUF on-start message

** Changes from 0.93.19 to 0.93.19.2
 * Changed to combined log (from NCSA access_log format) ala Drew Streib
 * Altered POST cgi code to handle bug in Netscape
 * SO_SNDBUF changes by Larry

** Changes from 0.93.17.2 to 0.93.19 (all 0.93.18.x changes inclusive)
 * Update of some copyright statements for 99
 * Replacement of sprintf with strlen/memcpy or strcpy/strcat 
   wherever possible
 * Significant rearrangement in alias.c, minor functional differences
   (some CGI environment variables handled differently)
 * Removal of die function. Replace with log_err_mesg and exit.
 * initial IPv6 stubs and support
 * Move #include "config.h" to top of boa.h where it will do some good
 * Stubs and functions for strstr and strdup
 * Seperation of buffer code into it's own file
 * Significant changes to cgi.c et al (cgi_header.c, etc...)
 * Speed patches by removal of "extra" calls to time(): Use global variable!
 * pipelining changes... it works now.
 * require content-length from clients (ala rfc1945)
 * alter body_read and body_write to work more efficiently with known content-length
 * move read(2) part to *after* parsing...
 * added support for additional header message in send_redirect_temp
 * change use of NO_ZERO_FILL_LENGTH to offsetof() use
 * Remove SO_REUSEADDR setting on each client socket, Paul Saab
 * Avoid SO_SNDBUF setting if possible
 * Large quantities of otherwise not-insignificant changes

** Changes from 0.93.17.2 to 0.93.17.3
 * Put on-the-fly directories back in, stripped down from the 0.92 version
 * Fixed DocumentRoot, ServerAdmin and ServerName null-value handling in
   CGI environment generation
 * Fixed argument order in Script* directives (bug introduced in 0.93.17.2)
 * Got rid of MAX_CGI_VARS because it was not being used consistently, or
   for that matter, at all, really.
 * Added some more FASCIST_LOGGING to cgi.c
 * Minor mmap patch by LRD for request.c

** Changes from 0.93.17.1 to 0.93.17.2
 * Added "Listen" directive for server bind address, as most recently
   suggested by David N. Welton
 * Put virtualhost feature in, was experimental in 0.92q

** Changes from 0.93.16.2 to 0.93.17.1
 * New config file parser (supposed to be more maintainable) (LRD)
 * Support for "|command" and ":host:port" syntax for logfiles (untested) (LRD)

** Changes for the 0.93 version **
 * Huge quantities of changes
 * keepalive Bugfix in 0.93.16.2 by Jon Nelson
   report by Craig Silverstein of Google fame.
 * patch for config.h by Craig Silverstein
 * fixed "Parent Directory" problem in boa_indexer for title "/"
   (Debian bug #36165)
 * More Craig Silverstein
   modifications, namely:
   ErrorLog        (if omitted, print to stderr)
   DocumentRoot    (if omitted, can only server user-dir files)
   DirectoryIndex  (if omitted, always use DirectoryMaker)
   MimeTypes       (if omitted, don't load -- users can use AddType instead)


** Changes from v0.92o to v0.92p **

 * Documented misbehavior of CGI, SIGHUP, short aliases, stale dircache.
 * Documented how to patch signals.c for use on SunOS.
 * Closed file descriptor leak when redirecting a bare directory URL to
 one with an appended "/".
 * Closed potential file descriptor leak if errors encountered generating
 on-the-fly index.
 * Cleaned up include file handling to be simultaneously compatible with
 Linux, SunOS, HP-UX, and AIX.
 * Supress message body for codes 302, 400, 403, 404, 500, and 501 if
 incoming request is "HEAD".

** Changes from v0.91 to v0.92o **
 (0.92o released 27 December, 1996)

 * Maintenance handover from Paul Phillips to Larry Doolittle
 * Changed (char)NULL to '\0'
 * Cleaned up signal handler prototypes in signals.c
 * Modified handling of CGI environment variable PATH_TRANSLATED,
 should now work the same as NCSA.
 * More conservative buffer size in add_cgi_env()
 * Build argv list for a CGI script according to spec
 * Speedup process_header_line, eliminate potential memory leak
 * Occasional spelling fixes and lint removal
 * Added REMOTE_PORT env var for CGI scripts, to allow easy ident lookups
 * Changed rfc822 time format
 * Log timeouts and broken connections
 * Fix mime suffix handling for filenames with multiple "."s
 * Initialize conn->time_last, fixes bug with rapid-fire connections
 * Performance tweak to req_write()
 * Changed http_version from float to char[8]
 * Rewrote on-the-fly directory generation; it works now
 * Added user configurable dircache directory in boa.conf
 * Fixed "simple" response bugs, including incorrect CGI handling
 * Keepalive (HTTP/1.1 draft) support, mostly by Jon Nelson
 * Close data_fd in 304 Not Modified flow of control
 * Switch socket flags to non-blocking before cgi handoff
 * Try to handle errno properly in the face of multiple errors
 * Close fd's of all other transactions before cgi handoff
 * Move real work for sighup and sigchld out of signal handler
 * Fix free(req->cgi_env) in request.c
 * Response message cleanup - better match to HTML-2.0 DTD
 * Experimental Virtual Host code from Russ Nelson 
 * Expand buffer for escaped URI in init_get()
 * SIGTERM triggers lame duck mode until all pending transactions complete
 * Close and unlink temp file for POST in parent process

** Changes from v0.90 to v0.91 **
 
 * Cleaned up main while loop
 * Optimized request line parsing
 * Added state machine for header reads -- necessary to deal wtih
 possibility of obtaining header data in multiple reads.  This 
 also allows interactive use of server.
 * Added 500/501 return codes for various conditions

** v0.90 **

 * Initial release
