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http

Performs an HTTP request using a message batch as the request body, and replaces the original message parts with the body of the response.

# Common config fields, showing default values
label: ""
http:
  url: http://localhost:4195/post
  verb: POST
  headers:
    Content-Type: application/octet-stream
  rate_limit: ""
  timeout: 5s
  parallel: false

If a processed message batch contains more than one message they will be sent in a single request as a multipart message. Alternatively, message batches can be sent in parallel by setting the field parallel to true.

The rate_limit field can be used to specify a rate limit resource to cap the rate of requests across all parallel components service wide.

The URL and header values of this type can be dynamically set using function interpolations described here.

In order to map or encode the payload to a specific request body, and map the response back into the original payload instead of replacing it entirely, you can use the branch processor.

Response Codes​

Benthos considers any response code between 200 and 299 inclusive to indicate a successful response, you can add more success status codes with the field successful_on.

When a request returns a response code within the backoff_on field it will be retried after increasing intervals.

When a request returns a response code within the drop_on field it will not be reattempted and is immediately considered a failed request.

Adding Metadata​

If the request returns an error response code this processor sets a metadata field http_status_code on the resulting message.

Use the field extract_headers to specify rules for which other headers should be copied into the resulting message from the response.

Error Handling​

When all retry attempts for a message are exhausted the processor cancels the attempt. These failed messages will continue through the pipeline unchanged, but can be dropped or placed in a dead letter queue according to your config, you can read about these patterns here.

Examples​

This example uses a branch processor to strip the request message into an empty body, grab an HTTP payload, and place the result back into the original message at the path repo.status:

pipeline:
  processors:
    - branch:
        request_map: 'root = ""'
        processors:
          - http:
              url: https://hub.docker.com/v2/repositories/jeffail/benthos
              verb: GET
        result_map: 'root.repo.status = this'

Fields​

url​

The URL to connect to. This field supports interpolation functions.

Type: string
Default: "http://localhost:4195/post"

verb​

A verb to connect with

Type: string
Default: "POST" 

# Examples


verb: POST


verb: GET


verb: DELETE

headers​

A map of headers to add to the request. This field supports interpolation functions.

Type: object
Default: {"Content-Type":"application/octet-stream"} 

# Examples


headers:
  Content-Type: application/octet-stream

metadata​

Specify optional matching rules to determine which metadata keys should be added to the HTTP request as headers.

Type: object

metadata.include_prefixes​

Provide a list of explicit metadata key prefixes to match against.

Type: array
Default: [] 

# Examples


include_prefixes:
  - foo_
  - bar_


include_prefixes:
  - kafka_


include_prefixes:
  - content-

metadata.include_patterns​

Provide a list of explicit metadata key regular expression (re2) patterns to match against.

Type: array
Default: [] 

# Examples


include_patterns:
  - .*


include_patterns:
  - _timestamp_unix$

oauth​

Allows you to specify open authentication via OAuth version 1.

Type: object

oauth.enabled​

Whether to use OAuth version 1 in requests.

Type: bool
Default: false

oauth.consumer_key​

A value used to identify the client to the service provider.

Type: string
Default: ""

oauth.consumer_secret​

A secret used to establish ownership of the consumer key.

Type: string
Default: ""

oauth.access_token​

A value used to gain access to the protected resources on behalf of the user.

Type: string
Default: ""

oauth.access_token_secret​

A secret provided in order to establish ownership of a given access token.

Type: string
Default: ""

oauth.request_url​

The URL of the OAuth provider.

Type: string
Default: ""

oauth2​

Allows you to specify open authentication via OAuth version 2 using the client credentials token flow.

Type: object

oauth2.enabled​

Whether to use OAuth version 2 in requests.

Type: bool
Default: false

oauth2.client_key​

A value used to identify the client to the token provider.

Type: string
Default: ""

oauth2.client_secret​

A secret used to establish ownership of the client key.

Type: string
Default: ""

oauth2.token_url​

The URL of the token provider.

Type: string
Default: ""

oauth2.scopes​

A list of optional requested permissions.

Type: array
Default: []
Requires version 3.45.0 or newer

jwt​

BETA: Allows you to specify JWT authentication.

Type: object

jwt.enabled​

Whether to use JWT authentication in requests.

Type: bool
Default: false

jwt.private_key_file​

A file with the PEM encoded via PKCS1 or PKCS8 as private key.

Type: string
Default: ""

jwt.signing_method​

A method used to sign the token such as RS256, RS384 or RS512.

Type: string
Default: ""

jwt.claims​

A value used to identify the claims that issued the JWT.

Type: object
Default: {}

basic_auth​

Allows you to specify basic authentication.

Type: object

basic_auth.enabled​

Whether to use basic authentication in requests.

Type: bool
Default: false

basic_auth.username​

A username to authenticate as.

Type: string
Default: ""

basic_auth.password​

A password to authenticate with.

Type: string
Default: ""

tls​

Custom TLS settings can be used to override system defaults.

Type: object

tls.enabled​

Whether custom TLS settings are enabled.

Type: bool
Default: false

tls.skip_cert_verify​

Whether to skip server side certificate verification.

Type: bool
Default: false

tls.enable_renegotiation​

Whether to allow the remote server to repeatedly request renegotiation. Enable this option if you're seeing the error message local error: tls: no renegotiation.

Type: bool
Default: false
Requires version 3.45.0 or newer

tls.root_cas​

An optional root certificate authority to use. This is a string, representing a certificate chain from the parent trusted root certificate, to possible intermediate signing certificates, to the host certificate.

Type: string
Default: "" 

# Examples


root_cas: |-
  -----BEGIN CERTIFICATE-----
  ...
  -----END CERTIFICATE-----

tls.root_cas_file​

An optional path of a root certificate authority file to use. This is a file, often with a .pem extension, containing a certificate chain from the parent trusted root certificate, to possible intermediate signing certificates, to the host certificate.

Type: string
Default: "" 

# Examples


root_cas_file: ./root_cas.pem

tls.client_certs​

A list of client certificates to use. For each certificate either the fields cert and key, or cert_file and key_file should be specified, but not both.

Type: array
Default: [] 

# Examples


client_certs:
  - cert: foo
    key: bar


client_certs:
  - cert_file: ./example.pem
    key_file: ./example.key

tls.client_certs[].cert​

A plain text certificate to use.

Type: string
Default: ""

tls.client_certs[].key​

A plain text certificate key to use.

Type: string
Default: ""

tls.client_certs[].cert_file​

The path to a certificate to use.

Type: string
Default: ""

tls.client_certs[].key_file​

The path of a certificate key to use.

Type: string
Default: ""

extract_headers​

Specify which response headers should be added to resulting messages as metadata. Header keys are lowercased before matching, so ensure that your patterns target lowercased versions of the header keys that you expect.

Type: object

extract_headers.include_prefixes​

Provide a list of explicit metadata key prefixes to match against.

Type: array
Default: [] 

# Examples


include_prefixes:
  - foo_
  - bar_


include_prefixes:
  - kafka_


include_prefixes:
  - content-

extract_headers.include_patterns​

Provide a list of explicit metadata key regular expression (re2) patterns to match against.

Type: array
Default: [] 

# Examples


include_patterns:
  - .*


include_patterns:
  - _timestamp_unix$

rate_limit​

An optional rate limit to throttle requests by.

Type: string
Default: ""

timeout​

A static timeout to apply to requests.

Type: string
Default: "5s"

retry_period​

The base period to wait between failed requests.

Type: string
Default: "1s"

max_retry_backoff​

The maximum period to wait between failed requests.

Type: string
Default: "300s"

retries​

The maximum number of retry attempts to make.

Type: int
Default: 3

backoff_on​

A list of status codes whereby the request should be considered to have failed and retries should be attempted, but the period between them should be increased gradually.

Type: array
Default: [429]

drop_on​

A list of status codes whereby the request should be considered to have failed but retries should not be attempted. This is useful for preventing wasted retries for requests that will never succeed. Note that with these status codes the request is dropped, but message that caused the request will not be dropped.

Type: array
Default: []

successful_on​

A list of status codes whereby the attempt should be considered successful, this is useful for dropping requests that return non-2XX codes indicating that the message has been dealt with, such as a 303 See Other or a 409 Conflict. All 2XX codes are considered successful unless they are present within backoff_on or drop_on, regardless of this field.

Type: array
Default: []

proxy_url​

An optional HTTP proxy URL.

Type: string
Default: ""

parallel​

When processing batched messages, whether to send messages of the batch in parallel, otherwise they are sent within a single request.

Type: bool
Default: false