forwardhttp's Introduction

Retying http forwarder

This HTTP-service will act as a persistent retrying queue. Upon receipt of an HTTP POST, PUT and DELETE-requests, the service will asynchronously forward the received request to a remote host. When the remote host does not return a success, the request will be retried untill success or untill the retry scheme is exhausted. The remote host is indicated by:

the HTTP query parameter "HostToForwardTo" or
the HTTP-request-header "X-HostToForwardTo"

If required, an synchronous first delivery attempt can be made. This functionality is triggered by:

the HTTP query parameter "TryFirst" or
the HTTP-request-header "X-TryFirst"

Install

go get github.com/MarcGrol/forwardhttp

cd ${GOPTH}/src/github.com/MarcGrol/forwardhttp

Deploy

Use the gcloud command-line tool

gcloud auth login # expect browser to pop-up for interactive login

gcloud config set project forwardhttp # or your own <gcloud-project>

gcloud app deploy ./main/app.yaml  --quiet --version 1

Service is now available at https://forwardhttp.appspot.com (or your own https://.appspot.com).

Create queue

Use gcloud command-line

gcloud tasks queues create default \
    --max-attempts=10 \
    --max-concurrent-dispatches=5 # prevent overloading remote system

Test

https://forwardhttp.appspot.com

Example to test the interaction:

curl -vvv \
    --request POST \
    --data "This is expected to be sent back as part of response body." \
    "https://forwardhttp.appspot.com/post?HostToForwardTo=postman-echo.com&TryFirst=false"

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