Issue-432/stream headers

[Ryang-21]

• Propagates header options from Horizon.Server instantiation to CallBuilder.stream()

Closes #432

[Copilot]

Pull request overview

This PR fixes an issue where custom app headers (X-App-Name and X-App-Version) were not being sent when using streaming connections via CallBuilder.stream(). Since EventSource doesn't support custom headers, the implementation converts these headers to query parameters for streaming requests while maintaining header-based transmission for regular HTTP requests.

Changes:

• Added logic to extract X-App-Name and X-App-Version headers from httpClient defaults and append them as query parameters in streaming requests
• Added comprehensive integration tests for both HTTP and streaming scenarios with custom headers
• Updated unit test to include required httpClient parameter in CallBuilder constructor
• Updated CHANGELOG to document the fix

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
src/horizon/call_builder.ts	Implements header extraction logic that converts X-App-Name and X-App-Version headers to query parameters for EventSource streaming
test/integration/client_headers.test.ts	Adds two new integration tests verifying headers are sent correctly for both HTTP requests and streaming connections
test/unit/call_builders.test.ts	Updates CallBuilder instantiation to include required httpClient parameter
CHANGELOG.md	Documents the fix for X-App-Name and X-App-Version headers in streaming requests

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[github-actions]

Size Change: +65.9 kB (+0.15%)

Total Size: 42.6 MB

Filename	Size	Change
dist/stellar-sdk-minimal.js	5.57 MB	+11.4 kB (+0.21%)
dist/stellar-sdk-minimal.min.js	4.85 MB	+5.08 kB (+0.1%)
dist/stellar-sdk-no-axios.js	5.57 MB	+11.4 kB (+0.21%)
dist/stellar-sdk-no-axios.min.js	4.85 MB	+5.07 kB (+0.1%)
dist/stellar-sdk-no-eventsource.js	5.82 MB	+11.4 kB (+0.2%)
dist/stellar-sdk-no-eventsource.min.js	5.06 MB	+5.08 kB (+0.1%)
dist/stellar-sdk.js	5.82 MB	+11.4 kB (+0.2%)
dist/stellar-sdk.min.js	5.06 MB	+5.07 kB (+0.1%)

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