CDN:Request logic functions

server_addr

Returns the IP address of the CDN node that received the current request.

Syntax

server_addr()

Parameters

None.

Return value

The server's IP address. Data type: string.

Example

s_addr = server_addr()
say(concat('s_addr:', s_addr))

server_port

Returns the port on the CDN node that received the current request.

Syntax

server_port()

Parameters

None.

Return value

The server port. Data type: numeric.

Example

s_port = server_port()
say(concat('s_port:', tostring(s_port)))

client_addr

Returns the IP address of the client that sent the request.

Return values may not be accurate. See the accuracy note at the top of this page.

Syntax

client_addr()

Parameters

None.

Return value

The client's IP address. Data type: string.

Example

c_addr = client_addr()
c_port = client_port()
say(concat('c_addr:', c_addr))
say(concat('c_port:', tostring(c_port)))

client_port

Returns the port of the client that sent the request.

Syntax

client_port()

Parameters

None.

Return value

The client port. Data type: numeric.

Example

c_addr = client_addr()
c_port = client_port()
say(concat('c_addr:', c_addr))
say(concat('c_port:', tostring(c_port)))

client_country

Returns the country code of the client. Use with client_region() and client_isp() to build geo-based logic.

Return values may not be accurate. See the accuracy note at the top of this page.

Syntax

client_country()

Parameters

None.

Return value

The client's country code. Data type: string. For country code values, see Country codes.

Example

The following example retrieves the country, administrative division, and ISP of the client and prints each value if it is set.

c_country = client_country()
c_region = client_region()
c_isp = client_isp()
if c_country {
    say(concat('client_country:', c_country))
}
if c_region {
    say(concat('client_region:', c_region))
}
if c_isp {
    say(concat('client_isp:', c_isp))
}

client_region

Returns the administrative division code of the client's location.

Return values may not be accurate. See the accuracy note at the top of this page.

Syntax

client_region()

Parameters

None.

Return value

The client's administrative division code. Data type: string. For code values, see Administrative division codes.

Example

See the example under client_country.

client_isp

Returns the ISP code of the client's network.

Return values may not be accurate. See the accuracy note at the top of this page.

Syntax

client_isp()

Parameters

None.

Return value

The client's ISP code. Data type: string. For code values, see ISP codes.

ip_region

Returns the administrative division code of the city or province that a given IP address belongs to.

Syntax

ip_region(ipaddr)

Parameters

Return value

The administrative division code of the city or province. Data type: string. For code values, see Administrative division codes.

ip_isp

Returns the ISP code for a given IP address.

Syntax

ip_isp(ipaddr)

Parameters

Return value

The ISP code of the IP address. Data type: string. For code values, see ISP codes.

req_uri

Returns the URI of the request, excluding query parameters. When called with a pattern argument, matches the URI against the pattern instead.

Syntax

req_uri([pattern])

Parameters

Return value

• Without pattern: the request URI. Data type: string.

• With pattern: true if the URI matches, false otherwise.

Example

# req_uri
say(concat('req_uri: ', req_uri()))
if req_uri('/path1/path2') {
    say('req_uri: plain match')
}
if req_uri('re:/path[0-9]/path[0-9]') {
    say('req_uri: regex match')
}

For the request GET /path1/path2?mode=ip, the output is:

req_uri: /path1/path2
req_uri: plain match
req_uri: regex match

req_uri_basename

Returns the filename in the request URI, without the file extension. When called with a pattern argument, matches the filename against the pattern instead.

The filename is the last path component stripped of its extension. For example:

• /document_detail/30360.html → 30360

• /M604/guopei_mp4/ZYJY2017BJGL0101/2-1_g.mp4 → 2-1_g

• /tarball/foo.tar.bz2 → foo

Syntax

req_uri_basename([pattern])

Parameters

Return value

• Without pattern: the filename. Data type: string.

• With pattern: true if the filename matches, false otherwise.

Example

# req_uri_basename
basename = req_uri_basename()
say(concat('req_uri_basename: ', basename, ' ', len(basename)))
if req_uri_basename('foo') {
    say('req_uri_basename: plain match')
}
if req_uri_basename('re:^f.*') {
    say('req_uri_basename: regex match')
}

For the request GET /path1/path2/foo.tar.bz2, the output is:

req_uri_basename: foo 3
req_uri_basename: plain match
req_uri_basename: regex match

req_uri_ext

Returns the file extension in the request URI. When called with a pattern argument, matches the extension against the pattern instead.

The extension includes the leading dot. For multi-part extensions, the full suffix is returned. For example:

• /document_detail/30360.html → .html

• /M604/guopei_mp4/ZYJY2017BJGL0101/2-1_g.mp4 → .mp4

• /tarball/foo.tar.bz2 → .tar.bz2

Syntax

req_uri_ext([pattern])

Parameters

Return value

• Without pattern: the file extension. Data type: string.

• With pattern: true if the extension matches, false otherwise.

Example

# req_uri_ext
ext = req_uri_ext()
say(concat('req_uri_ext: ', ext, ' ', len(ext)))
if req_uri_ext('.tar.bz2') {
    say('req_uri_ext: plain match')
}
if req_uri_ext('re:\.tar\.bz[0-2]') {
    say('req_uri_ext: regex match')
}

For the request GET /path1/path2/foo.tar.bz2, the output is:

req_uri_ext: .tar.bz2 8
req_uri_ext: plain match
req_uri_ext: regex match

req_uri_seg

Returns URI path segments as a dictionary, keyed by 1-based index from left to right.

• Without idx: returns all segments.

• With idx: returns segments starting from that index (inclusive).

Each segment can contain up to 128 characters. Characters beyond this limit are dropped.

Syntax

req_uri_seg([idx])

Parameters

Return value

A dictionary of path segments keyed by index. Check each key before accessing it, as missing keys return empty.

Example

# req_uri_seg
def echo_each(k, v, u) {
    say(concat(get(u, 'msg'), ' : segs[', k, ']=', v))
}
# fetch all segments
segs = req_uri_seg()
foreach(segs, echo_each, ['msg'='req_uri_seg()'])
# fetch segments from idx 3
segs = req_uri_seg(3)
if get(segs, 3) {
    say(concat('req_uri_seg(3): segs[3]=', get(segs, 3)))
}
if get(segs, 4) {
    say(concat('req_uri_seg(3): segs[4]=', get(segs, 4)))
}
if get(segs, 5) {
    say(concat('req_uri_seg(3): segs[5]=', get(segs, 5)))
}

For the request GET /path1/path2/path3/path4?mode=req2, the output is:

req_uri_seg() : segs[1]=path1
req_uri_seg() : segs[2]=path2
req_uri_seg() : segs[3]=path3
req_uri_seg() : segs[4]=path4
req_uri_seg(3): segs[3]=path3
req_uri_seg(3): segs[4]=path4

req_uri_arg

Returns the value of a named query parameter. When called with a pattern argument, matches the parameter value against the pattern instead.

Syntax

req_uri_arg(name, [pattern])

Parameters

Return value

• Without pattern:

  • Parameter exists: the parameter value. Data type: string.

  • Parameter not found: false.

• With pattern:

  • Parameter exists and value matches: true.

  • Parameter exists but value does not match: false.

  • Parameter not found: false.

Example

# req_uri_arg
uid = req_uri_arg('uid')
if uid {
    say(concat('found uid ', uid))
} else {
    say('not found uid')
}
uid_chk = req_uri_arg('uid', '058334')
if uid_chk {
    say('check uid ok. plain mode')
} else {
    say('check uid fail. plain mode')
}
uid_chk = req_uri_arg('uid', 're:[0-9]+')
if uid_chk {
    say('check uid ok. regex mode')
} else {
    say('check uid fail. regex mode')
}

The output varies based on the request:

req_uri_query_string

Returns the full query string of the request, excluding the leading ?. When called with a pattern argument, matches the query string against the pattern instead.

Syntax

req_uri_query_string([pattern])

Parameters

Return value

• Without pattern: the query string. Data type: string.

• With pattern: true if the query string matches, false otherwise.

Example

# req_uri_query_string
say(concat('req_uri_query_string: ', req_uri_query_string()))
if req_uri_query_string('mode=') {
    say('check uri query string ok. plain mode')
} else {
    say('check uri query string fail. plain mode')
}
if req_uri_query_string('re:mode=[0-9a-z]+') {
    say('check uri query string ok. regex mode')
} else {
    say('check uri query string fail. regex mode')
}

For the request GET /path1/path2/path3/path4?mode=req5&token=34Deasd#243, the output is:

req_uri_query_string: mode=req5&token=34Deasd
check uri query string fail. plain mode
check uri query string ok. regex mode

req_scheme

Returns the scheme of the request (http or https). When called with a pattern argument, matches the scheme against the pattern instead.

Syntax

req_scheme([pattern])

Parameters

Return value

• Without pattern: the request scheme. Data type: string.

• With pattern: true if the scheme matches, false otherwise.

Example

# req_scheme
say(concat('req_scheme: ', req_scheme()))
if req_scheme('https') {
    say('check scheme ok. plain mode')
} else {
    say('check scheme fail. plain mode')
}
if req_scheme('re:https?') {
    say('check scheme ok. regex mode')
} else {
    say('check scheme fail. regex mode')
}

For an HTTP request, the output is:

req_scheme: http
check scheme fail. plain mode
check scheme ok. regex mode

req_method

Returns the HTTP method of the request. When called with a pattern argument, matches the method against the pattern instead.

Syntax

req_method([pattern])

Parameters

Return value

• Without pattern: the HTTP method. Data type: string.

• With pattern: true if the method matches, false otherwise.

Example

# req_method
say(concat('req_method: ', req_method()))
if req_method('GET') {
    say('check method ok. plain mode')
} else {
    say('check method fail. plain mode')
}
if req_method('re:(GET|POST)') {
    say('check method ok. regex mode')
} else {
    say('check method fail. regex mode')
}

For a POST request, the output is:

req_method: POST
check method fail. plain mode
check method ok. regex mode

req_host

Returns the value of the Host request header. When called with a pattern argument, matches the host against the pattern instead.

Syntax

req_host([pattern])

Parameters

Return value

• Without pattern: the Host header value. Data type: string.

• With pattern: true if the host matches, false otherwise.

Example

# req_host
say(concat('req_host: ', req_host()))
if req_host('image.developer.aliyundoc.com') {
    say('check host ok. plain mode')
} else {
    say('check host fail. plain mode')
}
if req_host('re:.+\.y\.z\.com') {
    say('check host ok. regex mode')
} else {
    say('check host fail. regex mode')
}

For the request Host: image.developer.aliyundoc.com, the output is:

req_host: image.developer.aliyundoc.com
check host fail. plain mode
check host ok. regex mode

req_user_agent

Returns the value of the User-Agent request header. When called with a pattern argument, matches the value against the pattern instead.

Syntax

req_user_agent([pattern])

Parameters

Return value

• Without pattern: the User-Agent header value. Data type: string.

• With pattern: true if the value matches, false otherwise.

Example

# req_user_agent
say(concat('req_user_agent: ', req_user_agent()))
if req_user_agent('Mozilla') {
    say('check user_agent ok. plain mode')
} else {
    say('check user_agent fail. plain mode')
}
if req_user_agent('re:^Mozilla') {
    say('check user_agent ok. regex mode')
} else {
    say('check user_agent fail. regex mode')
}

For the request User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64), the output is:

req_user_agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64)
check user_agent fail. plain mode
check user_agent ok. regex mode

req_referer

Returns the value of the Referer request header. When called with a pattern argument, matches the value against the pattern instead.

Syntax

req_referer([pattern])

Parameters

Return value

• Without pattern: the Referer header value. Data type: string.

• With pattern: true if the value matches, false otherwise.

Example

# req_referer
say(concat('req_referer: ', req_referer()))
if req_referer('https://example.aliyundoc.com/******00003') {
    say('check referer ok. plain mode')
} else {
    say('check referer fail. plain mode')
}
if req_referer('re:https://foo\.bar\.cn/\*+[0-9]+') {
    say('check referer ok. regex mode')
} else {
    say('check referer fail. regex mode')
}

For the request Referer: https://example.aliyundoc.com/******00003, the output is:

req_referer: https://example.aliyundoc.com/******00003
check referer ok. plain mode
check referer fail. regex mode

req_cookie

Returns the value of a named cookie. When called with a pattern argument, matches the cookie value against the pattern instead.

Syntax

req_cookie(name, [pattern])

Parameters

Return value

• Without pattern:

  • Cookie exists: the cookie value. Data type: string.

  • Cookie not found: false.

• With pattern:

  • Cookie exists and value matches: true.

  • Cookie exists but value does not match: false.

  • Cookie not found: false.

Example

# req_cookie
uid = req_cookie('uid')
if uid {
    say(concat('found cookie uid ', uid))
} else {
    say('not found cookie uid')
}
uid_chk = req_cookie('uid', '058334')
if uid_chk {
    say('check cookie uid ok. plain mode')
} else {
    say('check cookie uid fail. plain mode')
}
uid_chk = req_cookie('uid', 're:^[0-9]+')
if uid_chk {
    say('check cookie uid ok. regex mode')
} else {
    say('check cookie uid fail. regex mode')
}

For the request Cookie: uid=123456; token=value2, the output is:

found cookie uid 123456
check cookie uid fail. plain mode
check cookie uid ok. regex mode

req_first_x_forwarded_addr

Returns the first IP address in the X-Forwarded-For request header. When called with a pattern argument, matches the address against the pattern instead.

Syntax

req_first_x_forwarded_addr([pattern])

Parameters

Return value

• Without pattern: the first IP address in the X-Forwarded-For header. Data type: string.

• With pattern: true if the address matches, false otherwise.

Example

# req_first_x_forwarded
say(concat('req_first_x_forwarded: ', req_first_x_forwarded()))
if req_first_x_forwarded('1.1.1.1') {
    say('check first_x_forwarded ok. plain mode')
} else {
    say('check first_x_forwarded fail. plain mode')
}
if req_first_x_forwarded('re:1.1.1.[0-9]') {
    say('check first_x_forwarded ok. regex mode')
} else {
    say('check first_x_forwarded fail. regex mode')
}

For the request X-Forwarded-For: 1.1.X.X, 10.10.10.10, 172.16.0.1, the output is:

req_first_x_forwarded: 1.1.X.X
check first_x_forwarded ok. plain mode
check first_x_forwarded ok. regex mode

req_header

Returns the value of a named request header. When called with a pattern argument, matches the header value against the pattern instead.

Syntax

req_header(name, [pattern])

Parameters

Return value

• Without pattern:

  • Header exists: the header value. Data type: string.

  • Header not found: false.

• With pattern:

  • Header exists and value matches: true.

  • Header exists but value does not match: false.

  • Header not found: false.

Example

# req_header
uid = req_header('x_uid')
if uid {
    say(concat('found header x-uid ', uid))
} else {
    say('not found header x-uid')
}
uid_chk = req_header('x_uid', 'es developer')
if uid_chk {
    say('check header x-uid ok. plain mode')
} else {
    say('check header x-uid fail. plain mode')
}
uid_chk = req_header('x_uid', 're:es [a-z]+')
if uid_chk {
    say('check header x-uid ok. regex mode')
} else {
    say('check header x-uid fail. regex mode')
}

For the request X-UID: es developer, the output is:

found header x-uid es developer
check header x-uid ok. plain mode
check header x-uid ok. regex mode

req_id

Returns the Eagle Eye ID of the request. Each Eagle Eye ID uniquely identifies a single request.

Syntax

req_id()

Parameters

None.

Return value

The request ID. Data type: string.

Example

# req_id
say(concat('req_id: ', req_id()))

Example output: req_id: 6451c43d15815890089411000e