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HTTP Variables

Connection Variables​

The following variables are available under the conn namespace:

NameTypeDescription
conn.bytes_inint64The number of bytes entering the endpoint from the client.
conn.bytes_outint64The number of bytes leaving an endpoint to the client.
conn.client_ipstringSource IP of the connection to the ngrok endpoint.
conn.client_portstringSource port of the connection to the ngrok endpoint.
conn.end_tstimestampTimestamp when the connection to ngrok was closed.
conn.server_ipstringThe IP that this connection was established on.
conn.server_portint32The port that this connection was established on.
conn.start_tstimestampTimestamp when the connection to ngrok was started.

conn.bytes_in​

The number of bytes entering the endpoint from the client.

# snippet
---
expressions:
  - "conn.bytes_in > 1000"

conn.bytes_out​

The number of bytes leaving an endpoint to the client.

# snippet
---
expressions:
  - "conn.bytes_out > 1000"

conn.client_ip​

Source IP of the connection to the ngrok endpoint.

# snippet
---
expressions:
  - "conn.client_ip in ['::1', '127.0.0.1']"

conn.client_port​

Source port of the connection to the ngrok endpoint.

# snippet
---
expressions:
  - "conn.client_port == 80 "

conn.end_ts​

Timestamp when the connection to ngrok was closed.

# snippet
---
expressions:
  - "conn.end_ts > timestamp('2024-01-01')"

conn.server_ip​

The IP that this connection was established on.

# snippet
---
expressions:
  - "conn.server_ip == '192.168.1.1'"

conn.server_port​

The port that this connection was established on.

# snippet
---
expressions:
  - "conn.server_port == 80"

conn.start_ts​

Timestamp when the connection to ngrok was started.

# snippet
---
expressions:
  - "conn.start_ts > timestamp('2023-12-31')"

Connection Geo Variables​

The following variables are available under the conn.geo namespace:

NameTypeDescription
conn.geo.citystringThe name of the city, in EN, where the conn.client_ip is likely to originate.
conn.geo.countrystringThe name of the country, in EN, where the conn.client_ip is likely to originate.
conn.geo.country_codestringThe two-letter ISO country code where the conn.client_ip is likely to originate.
conn.geo.latitudestringThe approximate latitude where the conn.client_ip is likely to originate.
conn.geo.longitudestringThe approximate longitude where the conn.client_ip is likely to originate.
conn.geo.radiusstringThe radius in kilometers around the latitude and longitude where the conn.client_ip is likely to originate.
conn.geo.subdivisionstringThe name of the subdivision, in EN, where the conn.client_ip is likely to originate.

conn.geo.city​

The name of the city, in EN, where the conn.client_ip is likely to originate.

# snippet
---
expressions:
  - "conn.geo.city == 'Strongsville'"

conn.geo.country​

The name of the country, in EN, where the conn.client_ip is likely to originate.

# snippet
---
expressions:
  - "conn.geo.country == 'United States'"

conn.geo.country_code​

The two-letter ISO country code where the conn.client_ip is likely to originate.

# snippet
---
expressions:
  - "conn.geo.country_code != 'US'"

conn.geo.latitude​

The approximate latitude where the conn.client_ip is likely to originate.

# snippet
---
expressions:
  - "double(conn.geo.latitude) >= 45.0"

conn.geo.longitude​

The approximate longitude where the conn.client_ip is likely to originate.

# snippet
---
expressions:
  - "double(conn.geo.longitude) <= -93.0"

conn.geo.radius​

The radius in kilometers around the latitude and longitude where the conn.client_ip is likely to originate.

# snippet
---
expressions:
  - "conn.geo.radius <= '5'"

conn.geo.subdivision​

The name of the subdivision, in EN, where the conn.client_ip is likely to originate.

# snippet
---
expressions:
  - "conn.geo.subdivision == 'California'"

Connection TLS Variables​

The following variables are available under the conn.tls namespace:

NameTypeDescription
conn.tls.cipher_suitestringThe cipher suite selected during the TLS handshake.
conn.tls.snistringThe hostname included in the ClientHello message via the SNI extension.
conn.tls.versionstringThe version of the TLS protocol used between the client and the ngrok edge.

conn.tls.cipher_suite​

The cipher suite selected during the TLS handshake.

# snippet
---
expressions:
  - "conn.tls.cipher_suite == 'TLS_AES_128_GCM_SHA256'"

conn.tls.sni​

The hostname included in the ClientHello message via the SNI extension.

# snippet
---
expressions:
  - "conn.tls.sni == 'client.example.com'"

conn.tls.version​

The version of the TLS protocol used between the client and the ngrok edge.

# snippet
---
expressions:
  - "conn.tls.version == '1.3'"

Connection TLS Client Variables​

The following variables are available under the conn.tls.client namespace:

NameTypeDescription
conn.tls.client.extensions[]ExtensionAdditional information added to the certificate.
conn.tls.client.issuerstringThe issuing authority of the certificate as a string roughly following the RFC 2253 Distinguished Names syntax.
conn.tls.client.issuer.common_namestringCommon name of the issuing authority, usually the domain name.
conn.tls.client.issuer.country[]stringCountry name(s) where the issuing authority is located.
conn.tls.client.issuer.locality[]stringLocality or city of the issuing authority.
conn.tls.client.issuer.organization[]stringName(s) of the organization that issued the certificate.
conn.tls.client.issuer.organizational_unit[]stringDivision of the organization responsible for the certificate.
conn.tls.client.issuer.postal_code[]stringPostal code of the issuing authority.
conn.tls.client.issuer.province[]stringProvince or state of the issuing authority.
conn.tls.client.issuer.street_address[]stringStreet address of the issuing authority.
conn.tls.client.sanstringSubject alternative names of the client certificate.
conn.tls.client.san.dns_names[]stringDNS names in the subject alternative names.
conn.tls.client.san.email_addresses[]stringEmail addresses in the subject alternative names.
conn.tls.client.san.ip_addresses[]stringIP addresses in the subject alternative names.
conn.tls.client.san.uris[]stringURIs in the subject alternative names.
conn.tls.client.serial_numberstringUnique identifier for the certificate.
conn.tls.client.signature_algorithmstringAlgorithm used to sign the certificate.
conn.tls.client.subjectstringThe entity to whom the certificate is issued as a string roughly following the RFC 2253 Distinguished Names syntax.
conn.tls.client.subject.common_namestringCommon name of the subject, usually the domain name.
conn.tls.client.subject.country[]stringCountry name(s) where the subject of the certificate is located.
conn.tls.client.subject.locality[]stringLocality or city where the subject is located.
conn.tls.client.subject.organization[]stringName(s) of the organization to which the subject belongs.
conn.tls.client.subject.organizational_unit[]stringDivision of the organization to which the subject belongs.
conn.tls.client.subject.postal_code[]stringPostal code where the subject is located.
conn.tls.client.subject.province[]stringProvince or state where the subject is located.
conn.tls.client.subject.street_address[]stringStreet address where the subject is located.
conn.tls.client.validity.not_aftertimestampExpiration date and time when the certificate is no longer valid.
conn.tls.client.validity.not_beforetimestampStart date and time when the certificate becomes valid.

conn.tls.client.extensions​

Additional information added to the certificate.

# snippet
---
expressions:
  - "size(conn.tls.client.extensions) > 0"

conn.tls.client.issuer​

The issuing authority of the certificate as a string roughly following the RFC 2253 Distinguished Names syntax.

# snippet
---
expressions:
  - "conn.tls.client.issuer == 'CN=E1,O=Let's Encrypt,C=US'"

conn.tls.client.issuer.common_name​

Common name of the issuing authority, usually the domain name.

# snippet
---
expressions:
  - "conn.tls.client.issuer.common_name == 'exampleca.com'"

conn.tls.client.issuer.country​

Country name(s) where the issuing authority is located.

# snippet
---
expressions:
  - "conn.tls.client.issuer.country == ['US']"

conn.tls.client.issuer.locality​

Locality or city of the issuing authority.

# snippet
---
expressions:
  - "conn.tls.client.issuer.locality == ['Mountain View']"

conn.tls.client.issuer.organization​

Name(s) of the organization that issued the certificate.

# snippet
---
expressions:
  - "conn.tls.client.issuer.organization == ['Example CA']"

conn.tls.client.issuer.organizational_unit​

Division of the organization responsible for the certificate.

# snippet
---
expressions:
  - "conn.tls.client.issuer.organizational_unit == ['Certification Authority
    Division']"

conn.tls.client.issuer.postal_code​

Postal code of the issuing authority.

# snippet
---
expressions:
  - "conn.tls.client.issuer.postal_code == ['94043']"

conn.tls.client.issuer.province​

Province or state of the issuing authority.

# snippet
---
expressions:
  - "conn.tls.client.issuer.province == ['California']"

conn.tls.client.issuer.street_address​

Street address of the issuing authority.

# snippet
---
expressions:
  - "conn.tls.client.issuer.street_address == ['1234 Encryption Way']"

conn.tls.client.san​

Subject alternative names of the client certificate.

# snippet
---
expressions:
  - "conn.tls.client.san == 'DNS:www.example.com, DNS:example.com, IP
    Address:192.168.1.1'"

conn.tls.client.san.dns_names​

DNS names in the subject alternative names.

# snippet
---
expressions:
  - "conn.tls.client.san.dns_names == ['www.example.com', 'example.com']"

conn.tls.client.san.email_addresses​

Email addresses in the subject alternative names.

# snippet
---
expressions:
  - "conn.tls.client.san.email_addresses == ['ngrok-email1@example.com',
    'ngrok-email2@example.com']"

conn.tls.client.san.ip_addresses​

IP addresses in the subject alternative names.

# snippet
---
expressions:
  - "conn.tls.client.san.ip_addresses == ['192.168.1.1']"

conn.tls.client.san.uris​

URIs in the subject alternative names.

# snippet
---
expressions:
  - "conn.tls.client.san.uris == ['https://example.com/example']"

conn.tls.client.serial_number​

Unique identifier for the certificate.

# snippet
---
expressions:
  - "conn.tls.client.serial_number == 'b53017e79d4a5208b314a55d3574e0a8'"

conn.tls.client.signature_algorithm​

Algorithm used to sign the certificate.

# snippet
---
expressions:
  - "conn.tls.client.signature_algorithm == 'SHA256-RSA'"

conn.tls.client.subject​

The entity to whom the certificate is issued as a string roughly following the RFC 2253 Distinguished Names syntax.

# snippet
---
expressions:
  - "conn.tls.client.subject == 'CN=www.example.com'"

conn.tls.client.subject.common_name​

Common name of the subject, usually the domain name.

# snippet
---
expressions:
  - "conn.tls.client.subject.common_name == 'www.example.com'"

conn.tls.client.subject.country​

Country name(s) where the subject of the certificate is located.

# snippet
---
expressions:
  - "conn.tls.client.subject.country == ['US']"

conn.tls.client.subject.locality​

Locality or city where the subject is located.

# snippet
---
expressions:
  - "conn.tls.client.subject.locality == ['Mountain View']"

conn.tls.client.subject.organization​

Name(s) of the organization to which the subject belongs.

# snippet
---
expressions:
  - "conn.tls.client.subject.organization == ['Example Corp']"

conn.tls.client.subject.organizational_unit​

Division of the organization to which the subject belongs.

# snippet
---
expressions:
  - "conn.tls.client.subject.organizational_unit == ['Web Services']"

conn.tls.client.subject.postal_code​

Postal code where the subject is located.

# snippet
---
expressions:
  - "conn.tls.client.subject.postal_code == ['94043']"

conn.tls.client.subject.province​

Province or state where the subject is located.

# snippet
---
expressions:
  - "conn.tls.client.subject.province == ['California']"

conn.tls.client.subject.street_address​

Street address where the subject is located.

# snippet
---
expressions:
  - "conn.tls.client.subject.street_address == ['1234 Secure Blvd']"

conn.tls.client.validity.not_after​

Expiration date and time when the certificate is no longer valid.

# snippet
---
expressions:
  - "conn.tls.client.validity.not_after == timestamp('2023-01-01T00:00:00Z')"

conn.tls.client.validity.not_before​

Start date and time when the certificate becomes valid.

# snippet
---
expressions:
  - "conn.tls.client.validity.not_before == timestamp('2020-01-01T00:00:00Z')"

Connection TLS Server Variables​

The following variables are available under the conn.tls.server namespace:

NameTypeDescription
conn.tls.server.extensions[]ExtensionAdditional information added to the certificate.
conn.tls.server.issuerstringThe issuing authority of the certificate as a string roughly following the RFC 2253 Distinguished Names syntax.
conn.tls.server.issuer.common_namestringCommon name of the issuing authority, usually the domain name.
conn.tls.server.issuer.country[]stringCountry name(s) where the issuing authority is located.
conn.tls.server.issuer.locality[]stringLocality or city of the issuing authority.
conn.tls.server.issuer.organization[]stringName(s) of the organization that issued the certificate.
conn.tls.server.issuer.organizational_unit[]stringDivision of the organization responsible for the certificate.
conn.tls.server.issuer.postal_code[]stringPostal code of the issuing authority.
conn.tls.server.issuer.province[]stringProvince or state of the issuing authority.
conn.tls.server.issuer.street_address[]stringStreet address of the issuing authority.
conn.tls.server.sanstringSubject alternative names of the ngrok server's leaf TLS certificate.
conn.tls.server.san.dns_names[]stringDNS names in the subject alternative names of the ngrok server's leaf TLS certificate.
conn.tls.server.san.email_addresses[]stringEmail addresses in the subject alternative names of the ngrok server's leaf TLS certificate.
conn.tls.server.san.ip_addresses[]stringIP addresses in the subject alternative names of the ngrok server's leaf TLS certificate.
conn.tls.server.san.uris[]stringURIs in the subject alternative names of the ngrok server's leaf TLS certificate.
conn.tls.server.serial_numberstringUnique identifier for the certificate.
conn.tls.server.signature_algorithmstringAlgorithm used to sign the certificate.
conn.tls.server.subjectstringThe entity to whom the certificate is issued as a string roughly following the RFC 2253 Distinguished Names syntax.
conn.tls.server.subject.common_namestringCommon name of the subject, usually the domain name.
conn.tls.server.subject.country[]stringCountry name(s) where the subject of the certificate is located.
conn.tls.server.subject.locality[]stringLocality or city where the subject is located.
conn.tls.server.subject.organization[]stringName(s) of the organization to which the subject belongs.
conn.tls.server.subject.organizational_unit[]stringDivision of the organization to which the subject belongs.
conn.tls.server.subject.postal_code[]stringPostal code where the subject is located.
conn.tls.server.subject.province[]stringProvince or state where the subject is located.
conn.tls.server.subject.street_address[]stringStreet address where the subject is located.
conn.tls.server.validity.not_aftertimestampExpiration date and time when the certificate is no longer valid.
conn.tls.server.validity.not_beforetimestampStart date and time when the certificate becomes valid.

conn.tls.server.extensions​

Additional information added to the certificate.

# snippet
---
expressions:
  - "size(conn.tls.server.extensions) > 0"

conn.tls.server.issuer​

The issuing authority of the certificate as a string roughly following the RFC 2253 Distinguished Names syntax.

# snippet
---
expressions:
  - "conn.tls.server.issuer == 'CN=E1,O=Let's Encrypt,C=US'"

conn.tls.server.issuer.common_name​

Common name of the issuing authority, usually the domain name.

# snippet
---
expressions:
  - "conn.tls.server.issuer.common_name == 'exampleca.com'"

conn.tls.server.issuer.country​

Country name(s) where the issuing authority is located.

# snippet
---
expressions:
  - "conn.tls.server.issuer.country == ['US']"

conn.tls.server.issuer.locality​

Locality or city of the issuing authority.

# snippet
---
expressions:
  - "conn.tls.server.issuer.locality == ['Mountain View']"

conn.tls.server.issuer.organization​

Name(s) of the organization that issued the certificate.

# snippet
---
expressions:
  - "conn.tls.server.issuer.organization == ['Example CA']"

conn.tls.server.issuer.organizational_unit​

Division of the organization responsible for the certificate.

# snippet
---
expressions:
  - "conn.tls.server.issuer.organizational_unit == ['Certification Authority
    Division']"

conn.tls.server.issuer.postal_code​

Postal code of the issuing authority.

# snippet
---
expressions:
  - "conn.tls.server.issuer.postal_code == ['94043']"

conn.tls.server.issuer.province​

Province or state of the issuing authority.

# snippet
---
expressions:
  - "conn.tls.server.issuer.province == ['California']"

conn.tls.server.issuer.street_address​

Street address of the issuing authority.

# snippet
---
expressions:
  - "conn.tls.server.issuer.street_address == ['1234 Encryption Way']"

conn.tls.server.san​

Subject alternative names of the server certificate of the ngrok server's leaf TLS certificate.

# snippet
---
expressions:
  - "conn.tls.server.san == 'DNS:www.example.com, DNS:example.com, IP
    Address:192.168.1.1'"

conn.tls.server.san.dns_names​

DNS names in the subject alternative names of the ngrok server's leaf TLS certificate.

# snippet
---
expressions:
  - "conn.tls.server.san.dns_names == ['ngrok-dns.com', 'ngrok-dns2.com']"

conn.tls.server.san.email_addresses​

Email addresses in the subject alternative names of the ngrok server's leaf TLS certificate.

# snippet
---
expressions:
  - "conn.tls.server.san.email_addresses == ['ngrok-email1@example.com',
    'ngrok-email2@example.com']"

conn.tls.server.san.ip_addresses​

IP addresses in the subject alternative names of the ngrok server's leaf TLS certificate.

# snippet
---
expressions:
  - "conn.tls.server.san.ip_addresses == ['192.168.1.1']"

conn.tls.server.san.uris​

URIs in the subject alternative names of the ngrok server's leaf TLS certificate.

# snippet
---
expressions:
  - "conn.tls.server.san.uris == ['https://example.com/example']"

conn.tls.server.serial_number​

Unique identifier for the certificate.

# snippet
---
expressions:
  - "conn.tls.server.serial_number == 'b53017e79d4a5208b314a55d3574e0a8'"

conn.tls.server.signature_algorithm​

Algorithm used to sign the certificate.

# snippet
---
expressions:
  - "conn.tls.server.signature_algorithm == 'SHA256-RSA'"

conn.tls.server.subject​

The entity to whom the certificate is issued as a string roughly following the RFC 2253 Distinguished Names syntax.

# snippet
---
expressions:
  - "conn.tls.server.subject == 'CN=www.example.com'"

conn.tls.server.subject.common_name​

Common name of the subject, usually the domain name.

# snippet
---
expressions:
  - "conn.tls.server.subject.common_name == 'ngrok-server.example.com'"

conn.tls.server.subject.country​

Country name(s) where the subject of the certificate is located.

# snippet
---
expressions:
  - "conn.tls.server.subject.country == ['US']"

conn.tls.server.subject.locality​

Locality or city where the subject is located.

# snippet
---
expressions:
  - "conn.tls.server.subject.locality == ['Mountain View']"

conn.tls.server.subject.organization​

Name(s) of the organization to which the subject belongs.

# snippet
---
expressions:
  - "conn.tls.server.subject.organization == ['Example Corp']"

conn.tls.server.subject.organizational_unit​

Division of the organization to which the subject belongs.

# snippet
---
expressions:
  - "conn.tls.server.subject.organizational_unit == ['Web Services']"

conn.tls.server.subject.postal_code​

Postal code where the subject is located.

# snippet
---
expressions:
  - "conn.tls.server.subject.postal_code == ['94043']"

conn.tls.server.subject.province​

Province or state where the subject is located.

# snippet
---
expressions:
  - "conn.tls.server.subject.province == ['California']"

conn.tls.server.subject.street_address​

Street address where the subject is located.

# snippet
---
expressions:
  - "conn.tls.server.subject.street_address == ['1234 Secure Blvd']"

conn.tls.server.validity.not_after​

Expiration date and time when the certificate is no longer valid.

# snippet
---
expressions:
  - "conn.tls.server.validity.not_after > timestamp('2023-01-01T00:00:00Z')"

conn.tls.server.validity.not_before​

Start date and time when the certificate becomes valid.

# snippet
---
expressions:
  - "conn.tls.server.validity.not_before < timestamp('2020-01-01T00:00:00Z')"

Request Variables​

The following variables are available under the req namespace:

NameTypeDescription
req.content_encodinglist[string]The encoding set in the Content-Encoding header for this request as a list.
req.content_lengthint64The content length of the body in bytes. This may not be present if the request does not contain a body or if the client does not specify a content length because they are streaming the body.
req.content_typestringThe media type set in the Content-Type header for this request as a string.
req.content_type.parametersmap[string]stringThe parameters set in the Content-Type header as a key value map.
req.content_type.rawstringThe Content-Type header for this request as a string.
req.cookiesmap[string]*http.CookieThe key value map of HTTP cookie objects provided in the request.
req.headersmap[string][]stringThe request headers parsed as a map of lower-case names to values.
req.hoststringThe host header field value for this request.
req.locationstringThe location header value of the request.
req.methodstringThe request method.
req.trailersmap[string][]stringThe request trailers parsed as a map of lower-case names to values.
req.urlstringThe normalized full URL for this request.
req.url.authoritystringThe authority portion of the URL.
req.url.hoststringThe host for this request.
req.url.pathstringThe path for this request including the leading forward slash.
req.url.querystringThe full query string for this request excluding the leading question mark.
req.url.query_paramsmap[string][]stringThe request query string parsed as a map of names to values.
req.url.raw_pathstringThe un-normalized path including the leading slash for this request.
req.url.schemestringThe scheme for this request.
req.url.uristringThe URI (path and query) portion of the URL.
req.url.user_passwordstringThe user:password portion of the URL.
req.user_agentstringThe user-agent header value for this request.
req.versionstringThe HTTP version for this request.

req.content_encoding​

The encoding set in the Content-Encoding header for this request as a list.

# snippet
---
expressions:
  - "req.content_encoding[0] == 'br'"

req.content_length​

The content length of the body in bytes. This may not be present if the request does not contain a body or if the client does not specify a content length because they are streaming the body.

# snippet
---
expressions:
  - "req.content_length > 10000000"

req.content_type​

The media type set in the Content-Type header for this request as a string.

# snippet
---
expressions:
  - "req.content_type == 'application/json'"

req.content_type.parameters​

The parameters set in the Content-Type header for this request as a key value map.

# snippet
---
expressions:
  - "req.content_type.parameters['charset'] == 'utf-8'"

req.content_type.raw​

The Content-Type header for this request as a string.

# snippet
---
expressions:
  - "req.content_type.raw == 'application/json; charset=utf-8'"

req.cookies​

The key value map of HTTP cookie objects provided in the request.

# snippet
---
expressions:
  - "size(req.cookies) > 0"

req.headers​

The request headers parsed as a map of lower-case names to values.

# snippet
---
expressions:
  - "'Fizz' in req.headers['baz']"

req.host​

The host header field value for this request.

# snippet
---
expressions:
  - "req.host == 'nba.com'"

req.location​

The location header value of the request.

# snippet
---
expressions:
  - "req.location == '/index.html'"

req.method​

The request method.

# snippet
---
expressions:
  - "req.method == 'POST' || req.method == 'PUT'"

req.trailers​

The request trailers parsed as a map of lower-case names to values.

# snippet
---
expressions:
  - "'Fizz' in req.trailers['baz']"

req.url​

The normalized full URL for this request.

# snippet
---
expressions:
  - "req.url.contains('/admin')"

req.url.authority​

The authority portion of the URL.

# snippet
---
expressions:
  - "req.url.authority == 'user:password@nba.com'"

req.url.host​

The host for this request.

# snippet
---
expressions:
  - "req.url.host.contains(':8080')"

req.url.path​

The path part of this request including the leading forward slash.

# snippet
---
expressions:
  - "req.url.path.startsWith('/foo')"

req.url.query​

The full query string for this request excluding the leading question mark.

# snippet
---
expressions:
  - "req.url.query == 'number=23&name=jordan'"

req.url.query_params​

The request query string parsed as a map of names to values.

# snippet
---
expressions:
  - "'bar' in req.url.query_params['foo']"

req.url.raw_path​

The un-normalized path including the leading slash for this request.

# snippet
---
expressions:
  - "`req.url.raw_path.startsWith('/foo')"

req.url.scheme​

The scheme for this request.

# snippet
---
expressions:
  - "req.url.scheme == 'https'"

req.url.uri​

The URI (path and query) portion of the URL.

# snippet
---
expressions:
  - "req.url.uri.contains('/api/players?number=23&name=jordan')"

req.url.user_password​

The user:password portion of the URL.

# snippet
---
expressions:
  - "req.url.user_password == 'user:password'"

req.user_agent​

The user-agent header value for this request.

# snippet
---
expressions:
  - "req.user_agent.contains('curl')"

req.version​

The HTTP version for this request.

# snippet
---
expressions:
  - "req.version == 'HTTP/2"

Response Variables​

The following variables are available under the res namespace:

NameTypeDescription
res.content_encodinglist[string]The encoding set in the Content-Encoding header for this response as a list.
res.content_lengthint64The length of the content associated with the response.
res.content_typestringThe media type set in the Content-Type header for this response as a string.
res.content_type.parametersmap[string]stringThe parameters set in the Content-Type header for this response as a key value map.
res.content_type.rawstringThe Content-Type header for this response as a string.
res.cookiesmap[string]*http.CookieThe key value map of HTTP cookie objects provided in the response.
res.headersmap[string][]stringThe response headers parsed as a map of lower-case names to values.
res.locationstringThe location header value of this response.
res.status_codeint32The status code of this response.
res.trailersmap[string][]stringThe response trailers parsed as a map of lower-case names to values.

res.content_encoding​

The encoding set in the Content-Encoding header for this response as a list.

# snippet
---
expressions:
  - "res.content_encoding[0] == 'br'"

res.content_length​

The length of the content associated with the response.

# snippet
---
expressions:
  - "res.content_length != 0"

res.content_type​

The media type set in the Content-Type header for this response as a string.

# snippet
---
expressions:
  - "res.content_type == 'application/json'"

res.content_type.parameters​

The parameters set in the Content-Type header for this response as a key value map.

# snippet
---
expressions:
  - "res.content_type.parameters['charset'] == 'utf-8'"

res.content_type.raw​

The Content-Type header for this response as a string.

# snippet
---
expressions:
  - "res.content_type.raw == 'application/json; charset=utf-8'"

res.cookies​

The key value map of HTTP cookie objects provided in the response.

# snippet
---
expressions:
  - "size(req.cookies) > 0"

res.headers​

The headers of the response parsed as key maps to a list of values. Header keys must be written in canonical format.

# snippet
---
expressions:
  - "'Fizz' in res.headers['baz']"

res.location​

The location header value of the response.

# snippet
---
expressions:
  - "res.location == '/index.html'"

res.status_code​

The status code of this response.

# snippet
---
expressions:
  - "res.status_code >= 300"

res.trailers​

The trailers of the response parsed as key maps to a list of values. Trailer keys must be written in canonical format.

# snippet
---
expressions:
  - "'fizz' in res.trailers['baz']"

Time variables​

The following variables are available under the time namespace:

NameTypeDescription
time.nowstringThe current UTC time in RFC3339 format.

time.now​

The current UTC time in RFC3339 format.

# snippet
---
expressions:
  - "conn.end_ts < timestamp(time.now)"