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30 lines
1.1 KiB
Markdown
30 lines
1.1 KiB
Markdown
# Check If A URL Resolves To 200
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Ruby's built-in [`Net::HTTP`
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library](https://ruby-doc.org/stdlib-2.7.0/libdoc/net/http/rdoc/Net/HTTP.html)
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allows us to make different kinds of HTTP requests. We can use it to make a
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`HEAD` request which will request the status of a URL without actually fetching
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its contents.
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We can work directly with `Net::HTTP` using strings, but I find it is easier
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and less error-prone to get help from the `URI` class.
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To make a `#head` request, we first need to establish a connection to the host
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with [the `#start`
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method](https://ruby-doc.org/stdlib-2.7.0/libdoc/net/http/rdoc/Net/HTTP.html#method-i-start).
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Then we can initiate our request from that connection object.
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```ruby
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url = 'https://my.app.com/path/to/video.mp4'
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uri = URI(url)
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conn = Net::HTTP.start(uri.host, uri.port, use_ssl: true)
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resp = conn.head(uri.path)
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resp.code
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#=> "200"
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```
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We initiate the connection with the host and port of our URL. Then request the
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`HEAD` response for the path of our URL. If we are working with an `https` URL,
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we need to indicate that with `use_ssl: true` in the `#start` method options.
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