技术咨询：Itemtype属性应选http://schema.org还是https://schema.org？

Go with itemtype="https://schema.org/ImageObject"—it’s the modern, secure, and more efficient choice here. Let’s break down why:

• Avoid unnecessary redirects: Schema.org automatically redirects all HTTP requests to HTTPS. By using the HTTPS URL directly, you skip that extra round-trip, which is better for performance and eliminates any potential edge cases with how crawlers or validation tools handle redirects.
• Google’s validation confirms it’s safe: You mentioned Google’s SDTT doesn’t flag the HTTPS version, which is a key signal. Even though many of Google’s older structured data examples stick with HTTP, this is likely legacy from when HTTPS wasn’t the default across the web. The fact that their testing tool accepts and validates the HTTPS URL means it’s fully supported.
• Aligns with modern web best practices: HTTPS is now the standard for all web resources, including schema.org’s own site (which uses HTTPS exclusively). Using the HTTPS URL keeps your structured data consistent with broader web security and performance guidelines.

That said, if you’re concerned about backward compatibility, rest assured that both HTTP and HTTPS versions of schema.org URLs are recognized by major search engines. But choosing HTTPS is the future-proof option with clear benefits, so it’s the one I’d recommend.

内容的提问来源于stack exchange，提问作者Lovntola