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Golang multi-stage build to count links within a page for SEO

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# href-counter

> A Golang example application which counts internal vs. external hrefs within a page to rate SEO.

The `golang.org/x/net/html` package is used to iterate through all the HTML tokens in the web-page. It provides a working example of parsing HTML piece-by-piece.

This can be built with the Dockerfile in the repository or through `go get`.

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This book is a compilation of practical examples, lessons and techniques for Go developers. The topics cover the software lifecycle from learning the fundamentals, to software testing, to distribution and monitoring.

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### References

Used in these two blog posts:

* [Builder pattern vs. Multi-stage builds in Docker](http://blog.alexellis.io/mutli-stage-docker-builds/)
* [Docker docs: Use multi-stage builds](https://docs.docker.com/build/building/multi-stage/#use-multi-stage-builds)

### Running the example

* With Go

```sh
    go build

$ url=http://blog.alexellis.io/ ./href-counter
    {"internal":40,"external":2}

$ url=http://blog.alexellis.io/golang-json-api-client/  ./href-counter
    {"internal":17,"external":15}
    ```

* Build with multi-stage build

```sh
    ./build.sh
    ```

* Run with Docker

```sh
    docker run -e url=https://www.alexellis.io/ -ti alexellis2/href-counter:0.1.0
    {"internal":6,"external":11}
    ```

* Build with multiple Dockerfiles

```sh
    ./build-multi-dockerfiles.sh
    ```

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