Log.Fatal( http.ListenAndServe ( ":5000", router)) R.HandleFunc( "/document", restCreateDocument).Methods( "POST" ) The Pedagogical Resourceįor the rest of this tutorial, we'll be extending the following Gorilla/Mux based server stub: In this tutorial, we're looking at a solution for Go. In an earlier article, we covered a Django approach to this, so if Python is your language, then that's definitely worth a read. Fortunately, every production-ready web server framework has some level of CORS support.
#What is goland used for code#
Our next port of call then is to start looking at implementing this with as minimal a code change as possible. Obviously then, we want a solution that is similarly flexible (if not more flexible) while carrying a lower risk of misconfiguration. However, what a lot of people miss is that it also accepts literally anything that starts with ` ends in ` .` So, for example, even ` is a perfectly valid origin then according to the RegEx search string. It certainly does work for such cases, as both and would satisfy this RegEx. Risks of RegExĪ large number of CORS vulnerabilities are caused by misconfigured RegEx search strings in such reverse-proxy configurations.įor example, the RegEx string ` ^https\:\/\/.*example\.com$` might at first glance look like a valid solution to allowing us to have scripts from any subdomain of contact our API over HTTPS. The biggest of which being the RegEx at the centre of that approach. It does however have some significant shortcomings. This Reverse-Proxy approach we covered in that article is a very good stopgap solution as it is easy to set up and requires no code changes. Which, while a good DevOps solution to the problem, lacks a degree of flexibility and relies heavily on our RegEx being safe. In our Fixing "No 'Access-Control-Allow-Origin' Header Present" article, we did this validation and response generation with an Nginx Reverse-proxy and some RegEx. The target resource then validates these details and (if valid) responds with its own set of headers describing what is permissible and how long to cache the preflight response for. The OPTIONS request carries the ` Origin` header, along with some other information about the request (check out the CORS explainer. When a script makes a request to a different domain than it originated from, the browser first sends an ` OPTIONS` request to that resource to validate that the resource is expecting requests from external code.
It does this via a preflight exchange of headers with the target resource. That said, many features of Go, especially its concurrency and functional programming features, harken back to languages such as Erlang.Cross-Origin Resource Sharing (CORS) is a protocol for relaxing the Same-Origin policy to allow scripts from one domain (Origin) to access resources at another. Go is reminiscent of C in its syntax, making it relatively easy for longtime C developers to learn. Go does not have a large feature set, especially when compared to languages like C++. Go is meant to be simple to learn, straightforward to work with, and easy to read by other developers.
Go, or Golang as it is often called, was developed by Google employees-chiefly longtime Unix guru and Google distinguished engineer Rob Pike-but it’s not strictly speaking a “Google project.” Rather, Go is developed as a community-led open source project, spearheaded by leadership that has strong opinions about how Go should be used and the direction the language should take. Why was Go chosen by the developers of such projects as Docker and Kubernetes? What are Go’s defining characteristics, how does it differ from other programming languages, and what kinds of projects is it most suitable for building? In this article, we’ll explore Go’s feature set, the optimal use cases, the language’s omissions and limitations, and where Go may be going from here. During its nine-plus years in the wild, Google’s Go language, aka Golang-with version 1.13 out as of September 2019-has evolved from being a curiosity for alpha geeks to being the battle-tested programming language behind some of the world’s most important cloud-centric projects.
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