Reverse Proxy Support

[Ryang-21]

Why

When using a reverse proxy, only the first request went through the proxy.
Subsequent requests (pagination via .next(), linked resources) used URLs
from Horizon's _links, bypassing the proxy entirely.

What

Always replace the authority and protocol of response URLs with the
configured server's values, instead of only when they're empty. From documentation it appears that the _link in Horizon responses should be all self referencing so always replacing should be safe.

Summary

• Fixes reverse proxy support for Horizon.Server
• All requests now use the configured server URL, not Horizon's returned URLs

Closes #637

[Copilot]

Pull request overview

This PR fixes reverse proxy support in the Stellar SDK's Horizon client. Previously, only the initial request used the configured server URL, while subsequent pagination and linked resource requests used URLs from Horizon's _links responses, bypassing reverse proxies entirely.

Changes:

• Modified CallBuilder._sendNormalRequest() to always replace URL authority and protocol with configured server values
• Added integration test verifying pagination links use configured server URL
• Updated CHANGELOG with fix description

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src/horizon/call_builder.ts	Removed conditional check, now always replaces authority and protocol in URLs to ensure all requests go through configured server
test/integration/client_headers.test.ts	Added comprehensive test simulating reverse proxy scenario with pagination
CHANGELOG.md	Documented the fix under "Unreleased" section

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[github-actions]

Size Change: -14.1 kB (-0.03%)

Total Size: 45 MB

Filename	Size	Change
dist/stellar-sdk-minimal.js	5.95 MB	-2.53 kB (-0.04%)
dist/stellar-sdk-minimal.min.js	5.06 MB	-997 B (-0.02%)
dist/stellar-sdk-no-axios.js	5.95 MB	-2.53 kB (-0.04%)
dist/stellar-sdk-no-axios.min.js	5.06 MB	-997 B (-0.02%)
dist/stellar-sdk-no-eventsource.js	6.2 MB	-2.53 kB (-0.04%)
dist/stellar-sdk-no-eventsource.min.js	5.27 MB	-997 B (-0.02%)
dist/stellar-sdk.js	6.2 MB	-2.53 kB (-0.04%)
dist/stellar-sdk.min.js	5.27 MB	-997 B (-0.02%)

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