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HTTP

The http output plugin allows to flush your records into a HTTP endpoint. For now the functionality is pretty basic and it issues a POST request with the data records in MessagePack (or JSON) format.

Configuration Parameters

Key

Description

default

TLS / SSL

HTTP output plugin supports TLS/SSL, for more details about the properties available and general configuration, please refer to the TLS/SSL section.

Getting Started

In order to insert records into a HTTP server, you can run the plugin from the command line or through the configuration file:

Command Line

The http plugin, can read the parameters from the command line in two ways, through the -p argument (property) or setting them directly through the service URI. The URI format is the following:

http://host:port/something

Using the format specified, you could start Fluent Bit through:

$ fluent-bit -i cpu -t cpu -o http://192.168.2.3:80/something -m '*'

Configuration File

In your main configuration file, append the following Input & Output sections:

[INPUT]
    Name  cpu
    Tag   cpu

[OUTPUT]
    Name  http
    Match *
    Host  192.168.2.3
    Port  80
    URI   /something

pipeline:
    inputs:
        - name: cpu
          tag:  cpu
    outputs:
        - name: http
          match: '*'
          host: 192.168.2.3
          port: 80
          URI: /something

By default, the URI becomes tag of the message, the original tag is ignored. To retain the tag, multiple configuration sections have to be made based and flush to different URIs.

Another approach we also support is the sending the original message tag in a configurable header. It's up to the receiver to do what it wants with that header field: parse it and use it as the tag for example.

To configure this behaviour, add this config:

[OUTPUT]
    Name  http
    Match *
    Host  192.168.2.3
    Port  80
    URI   /something
    Format json
    header_tag  FLUENT-TAG

    outputs:
        - name: http
          match: '*'
          host: 192.168.2.3
          port: 80
          URI: /something
          format: json
          header_tag: FLUENT-TAG

Provided you are using Fluentd as data receiver, you can combine in_http and out_rewrite_tag_filter to make use of this HTTP header.

<source>
  @type http
  add_http_headers true
</source>

<match something>
  @type rewrite_tag_filter
  <rule>
    key HTTP_FLUENT_TAG
    pattern /^(.*)$/
    tag $1
  </rule>
</match>

Notice how we override the tag, which is from URI path, with our custom header

Example : Add a header

[OUTPUT]
    Name           http
    Match          *
    Host           127.0.0.1
    Port           9000
    Header         X-Key-A Value_A
    Header         X-Key-B Value_B
    URI            /something

    outputs:
        - name: http
          match: '*'
          host: 127.0.0.1
          port: 9000
          header:
            - X-Key-A Value_A
            - X-Key-B Value_B
          URI: /something

Example : Sumo Logic HTTP Collector

Suggested configuration for Sumo Logic using json_lines with iso8601 timestamps. The PrivateKey is specific to a configured HTTP collector.

[OUTPUT]
    Name             http
    Match            *
    Host             collectors.au.sumologic.com
    Port             443
    URI              /receiver/v1/http/[PrivateKey]
    Format           json_lines
    Json_date_key    timestamp
    Json_date_format iso8601

    outputs:
        - name: http
          match: '*'
          host: collectors.au.sumologic.com
          port: 443
          URI: /receiver/v1/http/[PrivateKey]
          format: json_lines
          json_date_key: timestamp
          json_date_format: iso8601

A sample Sumo Logic query for the CPU input. (Requires json_lines format with iso8601 date format for the timestamp field).

_sourcecategory="my_fluent_bit"
| json "cpu_p" as cpu
| timeslice 1m
| max(cpu) as cpu group by _timeslice