Name
    ngx_set_misc - Various set_xxx directives added to nginx's rewrite
    module (md5/sha1, sql/json quoting, and many more)

    *This module is not distributed with the Nginx source.* See the
    installation instructions.

Version
    This document describes ngx_set_misc v0.22
    (<https://github.com/agentzh/set-misc-nginx-module/tags>) released on 8
    September 2013.

Synopsis
        location /foo {
            set $a $arg_a;
            set_if_empty $a 56;

            # GET /foo?a=32 will yield $a == 32
            # while GET /foo and GET /foo?a= will
            # yeild $a == 56 here.
        }

        location /bar {
            set $foo "hello\n\n'\"\\";
            set_quote_sql_str $foo $foo; # for mysql

            # OR in-place editing:
            #   set_quote_sql_str $foo;

            # now $foo is: 'hello\n\n\'\"\\'
        }

        location /bar {
            set $foo "hello\n\n'\"\\";
            set_quote_pgsql_str $foo;  # for PostgreSQL

            # now $foo is: E'hello\n\n\'\"\\'
        }

        location /json {
            set $foo "hello\n\n'\"\\";
            set_quote_json_str $foo $foo;

            # OR in-place editing:
            #   set_quote_json_str $foo;

            # now $foo is: "hello\n\n'\"\\"
        }

        location /baz {
            set $foo "hello%20world";
            set_unescape_uri $foo $foo;

            # OR in-place editing:
            #   set_unescape_uri $foo;

            # now $foo is: hello world
        }

        upstream_list universe moon sun earth;
        upstream moon { ... }
        upstream sun { ... }
        upstream earth { ... }
        location /foo {
            set_hashed_upstream $backend universe $arg_id;
            drizzle_pass $backend; # used with ngx_drizzle
        }

        location /base32 {
            set $a 'abcde';
            set_encode_base32 $a;
            set_decode_base32 $b $a;

            # now $a == 'c5h66p35' and
            # $b == 'abcde'
        }

        location /base64 {
            set $a 'abcde';
            set_encode_base64 $a;
            set_decode_base64 $b $a;

            # now $a == 'YWJjZGU=' and
            # $b == 'abcde'
        }

        location /hex {
            set $a 'abcde';
            set_encode_hex $a;
            set_decode_hex $b $a;

            # now $a == '6162636465' and
            # $b == 'abcde'
        }

        # GET /sha1 yields the output
        #   aaf4c61ddcc5e8a2dabede0f3b482cd9aea9434d
        location /sha1 {
            set_sha1 $a hello;
            echo $a;
        }

        # ditto
        location /sha1 {
            set $a hello;
            set_sha1 $a;
            echo $a;
        }

        # GET /today yields the date of today in local time using format 'yyyy-mm-dd'
        location /today {
            set_local_today $today;
            echo $today;
        }

        # GET /signature yields the hmac-sha-1 signature
        # given a secret and a string to sign
        # this example yields the base64 encoded singature which is
        # "HkADYytcoQQzqbjQX33k/ZBB/DQ="
        location /signature {
            set $secret_key 'secret-key';
            set $string_to_sign "some-string-to-sign";
            set_hmac_sha1 $signature $secret_key $string_to_sign;
            set_encode_base64 $signature $signature;
            echo $signature;
        }

        location = /rand {
            set $from 3;
            set $to 15;
            set_random $rand $from $to;

            # or write directly
            #   set_random $rand 3 15;

            echo $rand;  # will print a random integer in the range [3, 15]
        }

Description
    This module extends the standard HttpRewriteModule's directive set to
    provide more functionalities like URI escaping and unescaping, JSON
    quoting, Hexadecimal/MD5/SHA1/Base32/Base64 digest encoding and
    decoding, random number generator, and more!

    Every directive provided by this module can be mixed freely with other
    [[HttpRewriteModule]]'s directives, like if and set. (Thanks to the
    Nginx Devel Kit (<https://github.com/simpl/ngx_devel_kit>)!)

Directives
  set_if_empty
    syntax: *set_if_empty $dst <src>*

    default: *no*

    context: *location, location if*

    phase: *rewrite*

    Assign the value of the argument "<src>" if and only if variable $dst is
    empty (i.e., not found or has an empty string value).

    In the following example,

        set $a 32;
        set_if_empty $a 56;

    the variable $dst will take the value 32 at last. But in the sample

        set $a '';
        set $value "hello, world"
        set_if_empty $a $value;

    $a will take the value "hello, world" at last.

  set_quote_sql_str
    syntax: *set_quote_sql_str $dst <src>*

    syntax: *set_quote_sql_str $dst*

    default: *no*

    context: *location, location if*

    phase: *rewrite*

    category: *ndk_set_var_value*

    When taking two arguments, this directive will quote the value of the
    second argument "<src>" by MySQL's string value quoting rule and assign
    the result into the first argument, variable $dst. For example,

        location /test {
            set $value "hello\n\r'\"\\";
            set_quote_sql_str $quoted $value;

            echo $quoted;
        }

    Then request "GET /test" will yield the following output

    'hello\n\r\'\"\\'

    Please note that we're using [[HttpEchoModule]]'s [directive
    (HttpEchoModule#echo)] here to output values of nginx variables
    directly.

    When taking a single argument, this directive will do in-place
    modification of the argument variable. For example,

        location /test {
            set $value "hello\n\r'\"\\";
            set_quote_sql_str $value;

            echo $value;
        }

    then request "GET /test" will give exactly the same output as the
    previous example.

    This directive is usually used to prevent SQL injection.

    This directive can be invoked by [[HttpLuaModule]]'s
    ndk.set_var.DIRECTIVE interface and [[HttpArrayVarModule]]'s
    array_map_op directive.

  set_quote_pgsql_str
    syntax: *set_quote_pgsql_str $dst <src>*

    syntax: *set_quote_pgsql_str $dst*

    default: *no*

    context: *location, location if*

    phase: *rewrite*

    category: *ndk_set_var_value*

    Very much like set_quote_sql_str, but with PostgreSQL quoting rules for
    SQL string literals.

  set_quote_json_str
    syntax: *set_quote_json_str $dst <src>*

    syntax: *set_quote_json_str $dst*

    default: *no*

    context: *location, location if*

    phase: *rewrite*

    category: *ndk_set_var_value*

    When taking two arguments, this directive will quote the value of the
    second argument "<src>" by JSON string value quoting rule and assign the
    result into the first argument, variable $dst. For example,

        location /test {
            set $value "hello\n\r'\"\\";
            set_quote_json_str $quoted $value;

            echo $quoted;
        }

    Then request "GET /test" will yield the following output

    "hello\n\r'\"\\"

    Please note that we're using [[HttpEchoModule]]'s [directive
    (HttpEchoModule#echo)] here to output values of nginx variables
    directly.

    When taking a single argument, this directive will do in-place
    modification of the argument variable. For example,

        location /test {
            set $value "hello\n\r'\"\\";
            set_quote_json_str $value;

            echo $value;
        }

    then request "GET /test" will give exactly the same output as the
    previous example.

    This directive can be invoked by [[HttpLuaModule]]'s
    ndk.set_var.DIRECTIVE interface and [[HttpArrayVarModule]]'s
    array_map_op directive.

  set_unescape_uri
    syntax: *set_unescape_uri $dst <src>*

    syntax: *set_unescape_uri $dst*

    default: *no*

    context: *location, location if*

    phase: *rewrite*

    category: *ndk_set_var_value*

    When taking two arguments, this directive will unescape the value of the
    second argument "<src>" as a URI component and assign the result into
    the first argument, variable $dst. For example,

        location /test {
            set_unescape_uri $key $arg_key;
            echo $key;
        }

    Then request "GET /test?key=hello+world%21" will yield the following
    output

    hello world!

    The nginx standard $arg_PARAMETER variable holds the raw (escaped) value
    of the URI parameter. So we need the "set_unescape_uri" directive to
    unescape it first.

    Please note that we're using [[HttpEchoModule]]'s [directive
    (HttpEchoModule#echo)] here to output values of nginx variables
    directly.

    When taking a single argument, this directive will do in-place
    modification of the argument variable. For example,

        location /test {
            set $key $arg_key;
            set_unescape_uri $key;

            echo $key;
        }

    then request "GET /test?key=hello+world%21" will give exactly the same
    output as the previous example.

    This directive can be invoked by [[HttpLuaModule]]'s
    ndk.set_var.DIRECTIVE interface and [[HttpArrayVarModule]]'s
    array_map_op directive.

  set_escape_uri
    syntax: *set_escape_uri $dst <src>*

    syntax: *set_escape_uri $dst*

    default: *no*

    context: *location, location if*

    phase: *rewrite*

    category: *ndk_set_var_value*

    Very much like the set_unescape_uri directive, but does the conversion
    the other way around, i.e., URL component escaping.

  set_hashed_upstream
    syntax: *set_hashed_upstream $dst <upstream_list_name> <src>*

    default: *no*

    context: *location, location if*

    phase: *rewrite*

    Hashes the string argument "<src>" into one of the upstream name
    included in the upstream list named "<upstream_list_name>". The hash
    function being used is simple modulo.

    Here's an example,

        upstream moon { ... }
        upstream sun { ... }
        upstream earth { ... }

        upstream_list universe moon sun earth;

        location /test {
            set_unescape_uri $key $arg_key;
            set $list_name universe;
            set_hashed_upstream $backend $list_name $key;

            echo $backend;        
        }

    Then "GET /test?key=blah" will output either "moon", "sun", or "earth",
    depending on the actual value of the "key" query argument.

    This directive is usually used to compute an nginx variable to be passed
    to [[HttpMemcModule]]'s memc_pass directive, [[HttpRedis2Module]]'s
    [[HttpRedis2Module#redis2_pass]] directive, and [[HttpProxyModule]]'s
    proxy_pass directive, among others.

  set_encode_base32
    syntax: *set_encode_base32 $dst <src>*

    syntax: *set_encode_base32 $dst*

    default: *no*

    context: *location, location if*

    phase: *rewrite*

    category: *ndk_set_var_value*

    When taking two arguments, this directive will encode the value of the
    second argument "<src>" to its base32(hex) digest and assign the result
    into the first argument, variable $dst. For example,

        location /test {
            set $raw "abcde";
            set_encode_base32 $digest $raw;

            echo $digest;
        }

    Then request "GET /test" will yield the following output

    c5h66p35

    Please note that we're using [[HttpEchoModule]]'s [directive
    (HttpEchoModule#echo)] here to output values of nginx variables
    directly.

    RFC forces the "[A-Z2-7]" RFC-3548 compliant encoding, but we're using
    the "base32hex" encoding ("[0-9a-v]").

    By default, the "=" character is used to pad the left-over bytes due to
    alignment. But the padding behavior can be completely disabled by
    setting set_misc_base32_padding "off".

    When taking a single argument, this directive will do in-place
    modification of the argument variable. For example,

        location /test {
            set $value "abcde";
            set_encode_base32 $value;

            echo $value;
        }

    then request "GET /test" will give exactly the same output as the
    previous example.

    This directive can be invoked by [[HttpLuaModule]]'s
    ndk.set_var.DIRECTIVE interface and [[HttpArrayVarModule]]'s
    array_map_op directive.

  set_misc_base32_padding
    syntax: *set_misc_base32_padding on|off*

    default: *on*

    context: *http, server, server if, location, location if*

    phase: *no*

    This directive can control whether to pad left-over bytes with the "="
    character when encoding a base32 digest by the set_encode_base32
    directive.

  set_decode_base32
    syntax: *set_decode_base32 $dst <src>*

    syntax: *set_decode_base32 $dst*

    default: *no*

    context: *location, location if*

    phase: *rewrite*

    category: *ndk_set_var_value*

    Similar to the set_encode_base32 directive, but does exactly the the
    opposite operation, .i.e, decoding a base32(hex) digest into its
    original form.

  set_encode_base64
    syntax: *set_encode_base64 $dst <src>*

    syntax: *set_encode_base64 $dst*

    default: *no*

    context: *location, location if*

    phase: *rewrite*

    category: *ndk_set_var_value*

    When taking two arguments, this directive will encode the value of the
    second argument "<src>" to its base64 digest and assign the result into
    the first argument, variable $dst. For example,

        location /test {
            set $raw "abcde";
            set_encode_base64 $digest $raw;

            echo $digest;
        }

    Then request "GET /test" will yield the following output

    YWJjZGU=

    Please note that we're using [[HttpEchoModule]]'s [directive
    (HttpEchoModule#echo)] here to output values of nginx variables
    directly.

    When taking a single argument, this directive will do in-place
    modification of the argument variable. For example,

        location /test {
            set $value "abcde";
            set_encode_base64 $value;

            echo $value;
        }

    then request "GET /test" will give exactly the same output as the
    previous example.

    This directive can be invoked by [[HttpLuaModule]]'s
    ndk.set_var.DIRECTIVE interface and [[HttpArrayVarModule]]'s
    array_map_op directive.

  set_decode_base64
    syntax: *set_decode_base64 $dst <src>*

    syntax: *set_decode_base64 $dst*

    default: *no*

    context: *location, location if*

    phase: *rewrite*

    category: *ndk_set_var_value*

    Similar to the set_encode_base64 directive, but does exactly the the
    opposite operation, .i.e, decoding a base64 digest into its original
    form.

  set_encode_hex
    syntax: *set_encode_hex $dst <src>*

    syntax: *set_encode_hex $dst*

    default: *no*

    context: *location, location if*

    phase: *rewrite*

    category: *ndk_set_var_value*

    When taking two arguments, this directive will encode the value of the
    second argument "<src>" to its hexadecimal digest and assign the result
    into the first argument, variable $dst. For example,

        location /test {
            set $raw "章亦春";
            set_encode_hex $digest $raw;

            echo $digest;
        }

    Then request "GET /test" will yield the following output

    e7aba0e4baa6e698a5

    Please note that we're using [[HttpEchoModule]]'s [directive
    (HttpEchoModule#echo)] here to output values of nginx variables
    directly.

    When taking a single argument, this directive will do in-place
    modification of the argument variable. For example,

        location /test {
            set $value "章亦春";
            set_encode_hex $value;

            echo $value;
        }

    then request "GET /test" will give exactly the same output as the
    previous example.

    This directive can be invoked by [[HttpLuaModule]]'s
    ndk.set_var.DIRECTIVE interface and [[HttpArrayVarModule]]'s
    array_map_op directive.

  set_decode_hex
    syntax: *set_decode_hex $dst <src>*

    syntax: *set_decode_hex $dst*

    default: *no*

    context: *location, location if*

    phase: *rewrite*

    category: *ndk_set_var_value*

    Similar to the set_encode_hex directive, but does exactly the the
    opposite operation, .i.e, decoding a hexadecimal digest into its
    original form.

  set_sha1
    syntax: *set_sha1 $dst <src>*

    syntax: *set_sha1 $dst*

    default: *no*

    context: *location, location if*

    phase: *rewrite*

    category: *ndk_set_var_value*

    When taking two arguments, this directive will encode the value of the
    second argument "<src>" to its SHA-1
    (<http://en.wikipedia.org/wiki/SHA-1>) digest and assign the result into
    the first argument, variable $dst. The hexadecimal form of the "SHA-1"
    digest will be generated automatically, use set_decode_hex to decode the
    result if you want the binary form of the "SHA-1" digest.

    For example,

        location /test {
            set $raw "hello";
            set_sha1 $digest $raw;

            echo $digest;
        }

    Then request "GET /test" will yield the following output

    aaf4c61ddcc5e8a2dabede0f3b482cd9aea9434d

    Please note that we're using [[HttpEchoModule]]'s [directive
    (HttpEchoModule#echo)] here to output values of nginx variables
    directly.

    When taking a single argument, this directive will do in-place
    modification of the argument variable. For example,

        location /test {
            set $value "hello";
            set_sha1 $value;

            echo $value;
        }

    then request "GET /test" will give exactly the same output as the
    previous example.

    This directive can be invoked by [[HttpLuaModule]]'s
    ndk.set_var.DIRECTIVE interface and [[HttpArrayVarModule]]'s
    array_map_op directive.

  set_md5
    syntax: *set_md5 $dst <src>*

    syntax: *set_md5 $dst*

    default: *no*

    context: *location, location if*

    phase: *rewrite*

    category: *ndk_set_var_value*

    When taking two arguments, this directive will encode the value of the
    second argument "<src>" to its MD5 (<http://en.wikipedia.org/wiki/MD5>)
    digest and assign the result into the first argument, variable $dst. The
    hexadecimal form of the "MD5" digest will be generated automatically,
    use set_decode_hex to decode the result if you want the binary form of
    the "MD5" digest.

    For example,

        location /test {
            set $raw "hello";
            set_md5 $digest $raw;

            echo $digest;
        }

    Then request "GET /test" will yield the following output

    5d41402abc4b2a76b9719d911017c592

    Please note that we're using [[HttpEchoModule]]'s [directive
    (HttpEchoModule#echo)] here to output values of nginx variables
    directly.

    When taking a single argument, this directive will do in-place
    modification of the argument variable. For example,

        location /test {
            set $value "hello";
            set_md5 $value;

            echo $value;
        }

    then request "GET /test" will give exactly the same output as the
    previous example.

    This directive can be invoked by [[HttpLuaModule]]'s
    ndk.set_var.DIRECTIVE interface and [[HttpArrayVarModule]]'s
    array_map_op directive.

  set_hmac_sha1
    syntax: *set_hmac_sha1 $dst <secret_key> <src>*

    syntax: *set_hmac_sha1 $dst*

    default: *no*

    context: *location, location if*

    phase: *rewrite*

    Computes the HMAC-SHA1 (<http://en.wikipedia.org/wiki/HMAC>) digest of
    the argument "<src>" and assigns the result into the argument variable
    $dst with the secret key "<secret_key>".

    The raw binary form of the "HMAC-SHA1" digest will be generated, use
    set_encode_base64, for example, to encode the result to a textual
    representation if desired.

    For example,

        location /test {
            set $secret 'thisisverysecretstuff';
            set $string_to_sign 'some string we want to sign';
            set_hmac_sha1 $signature $secret $string_to_sign;
            set_encode_base64 $signature $signature;
            echo $signature;
        }

    Then request "GET /test" will yield the following output

    R/pvxzHC4NLtj7S+kXFg/NePTmk=

    Please note that we're using [[HttpEchoModule]]'s [directive
    (HttpEchoModule#echo)] here to output values of nginx variables
    directly.

    This directive requires the OpenSSL library enabled in your Nignx build
    (usually by passing the "--with-http_ssl_module" option to the
    "./configure" script).

  set_random
    syntax: *set_random $res <from> <to>*

    default: *no*

    context: *location, location if*

    phase: *rewrite*

    Generates a (pseudo) random number (in textual form) within the range
    "[<$from>, <$to>]" (inclusive).

    Only non-negative numbers are allowed for the "<from>" and "<to>"
    arguments.

    When "<from>" is greater than "<to>", their values will be exchanged
    accordingly.

    For instance,

        location /test {
            set $from 5;                              
            set $to 7;                                
            set_random $res $from $to;                

            echo $res;                                
        }

    then request "GET /test" will output a number between 5 and 7 (i.e.,
    among 5, 6, 7).

    For now, there's no way to configure a custom random generator seed.

    Behind the scene, it makes use of the standard C function "rand()".

    This directive was first introduced in the "v0.22rc1" release.

    See also set_secure_random_alphanum and set_secure_random_lcalpha.

  set_secure_random_alphanum
    syntax: *set_secure_random_alphanum $res <length>*

    default: *no*

    context: *location, location if*

    phase: *rewrite*

    Generates a cryptographically-strong random string "<length>" characters
    long with the alphabet "[a-zA-Z0-9]".

    "<length>" may be between 1 and 64, inclusive.

    For instance,

        location /test {
            set_secure_random_alphanum $res 32;

            echo $res;
        }

    then request "GET /test" will output a string like
    "ivVVRP2DGaAqDmdf3Rv4ZDJ7k0gOfASz".

    This function depends on the presence of the "/dev/urandom" device,
    available on most UNIX-like systems.

    See also set_secure_random_lcalpha and set_random.

    This directive was first introduced in the "v0.22rc8" release.

  set_secure_random_lcalpha
    syntax: *set_secure_random_lcalpha $res <length>*

    default: *no*

    context: *location, location if*

    phase: *rewrite*

    Generates a cryptographically-strong random string "<length>" characters
    long with the alphabet "[a-z]".

    "<length>" may be between 1 and 64, inclusive.

    For instance,

        location /test {
            set_secure_random_lcalpha $res 32;

            echo $res;
        }

    then request "GET /test" will output a string like
    "kcuxcddktffsippuekhshdaclaquiusj".

    This function depends on the presence of the "/dev/urandom" device,
    available on most UNIX-like systems.

    This directive was first introduced in the "v0.22rc8" release.

    See also set_secure_random_alphanum and set_random.

  set_rotate
    syntax: *set_rotate $value <from> <to>*

    default: *no*

    context: *location, location if*

    phase: *rewrite*

    Increments $value but keeps it in range from "<from>" to "<to>". If
    $value is greater than "<to>" or less than "<from>" is will be set to
    "<from>" value.

    The current value after running this directive will always be saved on a
    per-location basis. And the this saved value will be used for
    incrementation when the $value is not initialized or has a bad value.

    Only non-negative numbers are allowed for the "<from>" and "<to>"
    arguments.

    When "<from>" is greater than "<to>", their values will be exchanged
    accordingly.

    For instance,

        location /rotate {
            default_type text/plain;
            set $counter $cookie_counter;
            set_rotate $counter 1 5;
            echo $counter;
            add_header Set-Cookie counter=$counter;
        }

    then request "GET /rotate" will output next number between 1 and 5
    (i.e., 1, 2, 3, 4, 5) on each refresh of the page. This directive may be
    userful for banner rotation purposes.

    Another example is to use server-side value persistence to do simple
    round-robin:

        location /rotate {
            default_type text/plain;
            set_rotate $counter 0 3;
            echo $counter;
        }

    And accessing "/rotate" will also output integer sequence 0, 1, 2, 3, 0,
    1, 2, 3, and so on.

    This directive was first introduced in the "v0.22rc7" release.

  set_local_today
    syntax: *set_local_today $dst*

    default: *no*

    context: *location, location if*

    phase: *rewrite*

    Set today's date ("yyyy-mm-dd") in localtime to the argument variable
    $dst.

    Here's an example,

        location /today {
            set_local_today $today;
            echo $today;
        }

    then request "GET /today" will output something like

    2011-08-16

    and year, the actual date you get here will vary every day ;)

    Behind the scene, this directive utilizes the "ngx_time" API in the
    Nginx core, so usually no syscall is involved due to the time caching
    mechanism in the Nginx core.

Caveats
    Do not use $arg_PARAMETER, $cookie_COOKIE, $http_HEADER or other special
    variables defined in the Nginx core module as the target variable in
    this module's directives. For instance,

        set_if_empty $arg_user 'foo';  # DO NOT USE THIS!

    may lead to segmentation faults.

Installation
    This module is included and enabled by default in the ngx_openresty
    bundle (<http://openresty.org>). If you want to install this module
    manually with your own Nginx source tarball, then follow the steps
    below:

    Grab the nginx source code from nginx.org (<http://nginx.org/>), for
    example, the version 1.4.2 (see nginx compatibility), and then build the
    source with this module:

        wget 'http://nginx.org/download/nginx-1.4.2.tar.gz'
        tar -xzvf nginx-1.4.2.tar.gz
        cd nginx-1.4.2/

        # Here we assume you would install you nginx under /opt/nginx/.
        ./configure --prefix=/opt/nginx \
            --with-http_ssl_module \
            --add-module=/path/to/ngx_devel_kit \
            --add-module=/path/to/set-misc-nginx-module

        make -j2
        make install

    Download the latest version of the release tarball of this module from
    set-misc-nginx-module file list
    (<http://github.com/agentzh/set-misc-nginx-module/tags>), and the latest
    tarball for ngx_devel_kit (<https://github.com/simpl/ngx_devel_kit>)
    from its file list (<https://github.com/simpl/ngx_devel_kit/tags>).

    Also, this module is included and enabled by default in the
    ngx_openresty bundle (<http://openresty.org/>).

Compatibility
    The following versions of Nginx should work with this module:

    *   1.4.x (last tested: 1.4.2)

    *   1.2.x (last tested: 1.2.9)

    *   1.1.x (last tested: 1.1.5)

    *   1.0.x (last tested: 1.0.15)

    *   0.9.x (last tested: 0.9.4)

    *   0.8.x (last tested: 0.8.54)

    *   0.7.x >= 0.7.46 (last tested: 0.7.68)

    If you find that any particular version of Nginx above 0.7.46 does not
    work with this module, please consider reporting a bug.

Report Bugs
    Although a lot of effort has been put into testing and code tuning,
    there must be some serious bugs lurking somewhere in this module. So
    whenever you are bitten by any quirks, please don't hesitate to

    1.  send a bug report or even patches to the openresty-en mailing list
        (<https://groups.google.com/group/openresty-en>),

    2.  or create a ticket on the issue tracking interface
        (<http://github.com/agentzh/set-misc-nginx-module/issues>) provided
        by GitHub.

Source Repository
    Available on github at agentzh/set-misc-nginx-module
    (<http://github.com/agentzh/set-misc-nginx-module>).

Changes
    The change logs for every release of this module can be obtained from
    the ngx_openresty bundle's change logs:

    http://openresty.org/#Changes

Test Suite
    This module comes with a Perl-driven test suite. The test cases
    (<http://github.com/agentzh/set-misc-nginx-module/tree/master/t/>) are
    declarative
    (<http://github.com/agentzh/set-misc-nginx-module/blob/master/t/escape-u
    ri.t>) too. Thanks to the Test::Nginx
    (<http://search.cpan.org/perldoc?Test::Nginx>) module in the Perl world.

    To run it on your side:

        $ PATH=/path/to/your/nginx-with-set-misc-module:$PATH prove -r t

    You need to terminate any Nginx processes before running the test suite
    if you have changed the Nginx server binary.

    Because a single nginx server (by default, "localhost:1984") is used
    across all the test scripts (".t" files), it's meaningless to run the
    test suite in parallel by specifying "-jN" when invoking the "prove"
    utility.

Getting involved
    You'll be very welcomed to submit patches to the author or just ask for
    a commit bit to the source repository on GitHub.

Author
    Yichun Zhang (agentzh) *<agentzh@gmail.com>*, CloudFlare Inc.

    This wiki page is also maintained by the author himself, and everybody
    is encouraged to improve this page as well.

Copyright & License
    Copyright (C) 2009-2013, Yichun Zhang (章亦春) <agentzh@gmail.com>.

    This module is licensed under the terms of the BSD license.

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions are
    met:

    *   Redistributions of source code must retain the above copyright
        notice, this list of conditions and the following disclaimer.

    *   Redistributions in binary form must reproduce the above copyright
        notice, this list of conditions and the following disclaimer in the
        documentation and/or other materials provided with the distribution.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
    IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
    PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
    HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
    SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
    TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
    LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
    NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

See Also
    *   Nginx Devel Kit (<https://github.com/simpl/ngx_devel_kit>)

    *   The ngx_openresty bundle (<http://openresty.org>)