Add --stream option to output HTTP response body as it arrives

[Copilot]

Implements streaming response output for better UX with long-running requests and streaming APIs. Currently, all responses are buffered until complete before any output is shown.

Changes

Command-line interface:

• Added --stream / -S option to enable streaming mode
• Automatically falls back to buffered mode for binary responses and --download flag

Core implementation:

• RequestExecutor.InvokeStreamingRequest(): Uses HttpCompletionOption.ResponseHeadersRead to start receiving data immediately
• Outputs response headers once received, then streams body line-by-line to console
• Respects response encoding from Content-Type header instead of assuming UTF-8
• HttpResponseModel.Bytes: Changed from init to set to support incremental updates

State tracking:

• IsStreamingMode flag set when --stream option present
• StreamingCompleted flag set after successful streaming to skip normal output formatting

Usage

# Stream JSON response
dotnet-http GET https://api.example.com/stream --stream

# Stream with body-only output
dotnet-http GET https://api.example.com/data -S -b

Binary responses and downloads automatically use buffered mode regardless of flag.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• httpbin.org
  • Triggering command: /home/REDACTED/work/dotnet-httpie/dotnet-httpie/tests/HTTPie.IntegrationTest/bin/Debug/net10.0/HTTPie.IntegrationTest --internal-msbuild-node /home/REDACTED/.local/share/eb0b5e397f8d46c597913dcb38a813f7/.p (dns block)
  • Triggering command: /home/REDACTED/work/dotnet-httpie/dotnet-httpie/src/HTTPie/bin/Debug/net10.0/dotnet-httpie GET REDACTED --stream (dns block)
  • Triggering command: /home/REDACTED/work/dotnet-httpie/dotnet-httpie/tests/HTTPie.IntegrationTest/bin/Debug/net10.0/HTTPie.IntegrationTest --internal-msbuild-node /home/REDACTED/.local/share/d5029fa786974acbb89a522699550d97/.p (dns block)
• reservation.weihanli.xyz
  • Triggering command: /home/REDACTED/work/dotnet-httpie/dotnet-httpie/tests/HTTPie.IntegrationTest/bin/Debug/net10.0/HTTPie.IntegrationTest --internal-msbuild-node /home/REDACTED/.local/share/eb0b5e397f8d46c597913dcb38a813f7/.p (dns block)
  • Triggering command: /home/REDACTED/work/dotnet-httpie/dotnet-httpie/tests/HTTPie.IntegrationTest/bin/Debug/net10.0/HTTPie.IntegrationTest --internal-msbuild-node /home/REDACTED/.local/share/d5029fa786974acbb89a522699550d97/.p (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Stream http response output</issue_title>
<issue_description>Is your feature request related to a problem? Please describe.

Currently, the response will need to wait for response body complete, for streaming response it's not friendly, it would be better to support stream response body, while we may want to ignore the file download or binary responses

Describe the solution you'd like

Stream response body

</issue_description>

Comments on the Issue (you are @copilot in this section)

Note

Custom agent used: dotnet expert
Build amazing things in C#

• Fixes Stream http response output #122

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