Summary

Updates UriContent's constructors to make the mediaType parameter optional. When not supplied or null is passed, the media type is inferred from the file extension on the URI using the existing MediaTypeMap.GetMediaType utility. If there is no file extension or it's unknown, "application/octet-stream" is used as the default. Both absolute and relative URIs are supported for inference.

Changes

• Modified both UriContent(string, string?) and UriContent(Uri, string?) constructors to accept nullable mediaType with default null
• Added private InferMediaType helper that safely handles both absolute URIs (via Uri.AbsolutePath) and relative URIs (via Uri.OriginalString with query string/fragment stripping)
• Added DefaultMediaType constant for "application/octet-stream" fallback (same pattern used in DataContent)
• Updated XML doc comments to document the new inference behavior
• Updated API baseline JSON to reflect new constructor signatures
• Added comprehensive tests for inference, fallback, and explicit override scenarios covering absolute URIs, relative URIs, query string parameters, and URI fragments

Usage

// Before: mediaType was required
var content = new UriContent("http://example.com/photo.jpg", "image/jpeg");

// After: mediaType is optional and inferred from the file extension
var content = new UriContent("http://example.com/photo.jpg"); // MediaType = "image/jpeg"
var content2 = new UriContent("http://example.com/data"); // MediaType = "application/octet-stream"
var content3 = new UriContent("http://example.com/photo.jpg", "custom/type"); // MediaType = "custom/type"

// Also works with relative URIs
var content4 = new UriContent(new Uri("photo.jpg", UriKind.Relative)); // MediaType = "image/jpeg"
var content5 = new UriContent(new Uri("photo.jpg?size=large#top", UriKind.Relative)); // MediaType = "image/jpeg"

Microsoft Reviewers: Open in CodeFlow

💬 Send tasks to Copilot coding agent from Slack and Teams to turn conversations into code. Copilot posts an update in your thread when it's finished.