How to Retrieve File Content from GitHub Using the REST API v3

Spring Cloud often uses centralized configuration, where backend services store their configuration files in a remote GitHub repository and retrieve them through a configuration service, allowing all micro‑services to obtain the same settings from a single source.

Centralized configuration simplifies maintenance; for example, when a database password changes, updating a single configuration file in GitHub propagates the change to all services without modifying each application individually.

Instead of crawling GitHub pages, the article recommends using GitHub's official REST API v3 to directly obtain file contents, which is more reliable and efficient.

The API endpoint for fetching a file is documented on the GitHub developer site (https://developer.github.com/v3/), typically using a GET request to https://api.github.com/repos/{owner}/{repo}/contents/{path}.

For public repositories the request works without extra credentials, but private repositories require authentication.

Basic authentication (username and password) is discouraged due to security concerns; instead, GitHub provides Personal Access Tokens (PAT) as a safer method.

To create a PAT, navigate to GitHub Settings → Developer settings → Personal access tokens, click “Generate new token”, give it a description, and grant the repo scope (or more specific scopes as needed). After creation, GitHub displays the token string.

When accessing a private repository, include the token in the request header, e.g., Authorization: token YOUR_PERSONAL_ACCESS_TOKEN, which authenticates the call and allows the file content to be retrieved.

The article concludes that using GitHub's REST API with a Personal Access Token provides a simple and secure way to fetch configuration files from both public and private repositories.