Why Does My Go HTTP Server Return Empty Responses with \'text/plain\' Content-Type?

Resolving JSON Response Issues in Go: A Comprehensive Guide

In this article, we will delve into an issue encountered when creating JSON responses in Go and explore the solution.

Problem Statement:

A developer encountered issues while building a simple HTTP server and handling JSON responses. Despite using code similar to samples found online, an empty response with a content-type of "text/plain" was returned.

Analysis:

A careful comparison of the developer's code and the working sample revealed a subtle difference: the variables in the response body struct were not capitalized in the developer's code. This hinders the JSON marshaling process, as Go requires struct field names to be exported (capitalized) in order to be serialized into JSON.

Solution:

To resolve this issue, the variables in the ResponseCommands struct must be capitalized, as seen below:

<code class="go">type ResponseCommands struct {
    Key   string
    Value bool
}</code>

With this modification, Go will properly recognize the struct fields and serialize them into JSON. The resulting response will now contain the expected JSON data, and the content-type header will be set correctly to "application/json."

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