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Important: This documentation is about an older version. It's relevant only to the release noted, many of the features and functions have been updated or replaced. Please view the current version.

Open source


remote.http exposes the response body of a URL to other components. The URL is polled for changes so that the most recent content is always available.

The most common use of remote.http is to load discovery targets from an HTTP server.

Multiple remote.http components can be specified by giving them different labels.


remote.http "LABEL" {
  url = "URL_TO_POLL"


The following arguments are supported:

urlstringURL to poll.yes
methodstringDefine HTTP method for the request"GET"no
headersmap(string)Custom headers for the request.{}no
poll_frequencydurationFrequency to poll the URL."1m"no
poll_timeoutdurationTimeout when polling the URL."10s"no
is_secretboolWhether the response body should be treated as a secret.falseno

When remote.http performs a poll operation, an HTTP GET request is made against the URL specified by the url argument. A poll is triggered by the following:

  • When the component first loads.
  • Every time the component’s arguments get re-evaluated.
  • At the frequency specified by the poll_frequency argument.

The poll is successful if the URL returns a 200 OK response code. All other response codes are treated as errors and mark the component as unhealthy. After a successful poll, the response body from the URL is exported.


The following blocks are supported inside the definition of remote.http:

clientclientHTTP client settings when connecting to the
client > basic_authbasic_authConfigure basic_auth for authenticating to the
client > authorizationauthorizationConfigure generic authorization to the
client > oauth2oauth2Configure OAuth2 for authenticating to the
client > oauth2 > tls_configtls_configConfigure TLS settings for connecting to the
client > tls_configtls_configConfigure TLS settings for connecting to the

The > symbol indicates deeper levels of nesting. For example, client > basic_auth refers to an basic_auth block defined inside a client block.

client block

The client block configures settings used to connect to the HTTP server.

bearer_token_filestringFile containing a bearer token to authenticate
bearer_tokensecretBearer token to authenticate
enable_http2boolWhether HTTP2 is supported for requests.trueno
follow_redirectsboolWhether redirects returned by the server should be followed.trueno
proxy_urlstringHTTP proxy to send requests

bearer_token, bearer_token_file, basic_auth, authorization, and oauth2 are mutually exclusive, and only one can be provided inside of a http_client_config block.

basic_auth block

The basic_auth block configures basic authentication to use when polling the configured URL.

password_filestringFile containing the basic auth
passwordsecretBasic auth
usernamestringBasic auth

password and password_file are mutually exclusive, and only one can be provided inside a basic_auth block.

authorization block

The authorization block configures custom authorization to use when polling the configured URL.

credentials_filestringFile containing the secret
typestringAuthorization type, for example, “Bearer”.no

credential and credentials_file are mutually exclusive, and only one can be provided inside an authorization block.

oauth2 block

The oauth2 block configures OAuth2 authorization to use when polling the configured URL.

client_idstringOAuth2 client
client_secret_filestringFile containing the OAuth2 client
client_secretsecretOAuth2 client
endpoint_paramsmap(string)Optional parameters to append to the token
proxy_urlstringOptional proxy URL for OAuth2
scopeslist(string)List of scopes to authenticate
token_urlstringURL to fetch the token

client_secret and client_secret_file are mutually exclusive, and only one can be provided inside an oauth2 block.

The oauth2 block may also contain a separate tls_config sub-block.

tls_config block

The tls_config block configures TLS settings for connecting to HTTPS servers.

ca_pemstringCA PEM-encoded text to validate the server
ca_filestringCA certificate to validate the server
cert_pemstringCertificate PEM-encoded text for client
cert_filestringCertificate file for client
insecure_skip_verifyboolDisables validation of the server
key_filestringKey file for client
key_pemsecretKey PEM-encoded text for client
min_versionstringMinimum acceptable TLS
server_namestringServerName extension to indicate the name of the

The following pairs of arguments are mutually exclusive and can’t both be set simultaneously:

  • ca_pem and ca_file
  • cert_pem and cert_file
  • key_pem and key_file

When configuring client authentication, both the client certificate (using cert_pem or cert_file) and the client key (using key_pem or key_file) must be provided.

When min_version is not provided, the minimum acceptable TLS version is inherited from Go’s default minimum version, TLS 1.2. If min_version is provided, it must be set to one of the following strings:

  • "TLS10" (TLS 1.0)
  • "TLS11" (TLS 1.1)
  • "TLS12" (TLS 1.2)
  • "TLS13" (TLS 1.3)

Exported fields

The following field is exported and can be referenced by other components:

contentstring or secretThe contents of the

If the is_secret argument was true, content is a secret type.

Component health

Instances of remote.http report as healthy if the most recent HTTP GET request of the specified URL succeeds.

Debug information

remote.http does not expose any component-specific debug information.

Debug metrics

remote.http does not expose any component-specific debug metrics.


This example reads a JSON array of objects from an endpoint and uses them as a set of scrape targets:

remote.http "targets" {
  url = env("MY_TARGETS_URL")

prometheus.scrape "default" {
  targets    = json_decode(remote.http.targets.content)
  forward_to = [prometheus.remote_write.default.receiver]

prometheus.remote_write "default" {
  client {
    url = env("PROMETHEUS_URL")