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fix: correct adjacent server URL rewriting when behind a reverse proxy/load balancer #989

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fix: correct adjacent server URL rewriting when behind a reverse proxy/load balancer #989

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9d3d111
fix: correct adjacent server URL rewriting when behind a reverse prox…
sujen1412 May 28, 2026
65a5d66
fix: address review feedback on adjacent server URL rewriting
sujen1412 May 28, 2026
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31 changes: 27 additions & 4 deletions adjacent-servers/adjacent-servers-proxy.js
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Original file line number Diff line number Diff line change
Expand Up @@ -25,6 +25,10 @@ function initAdjacentServersProxy(app, isDocker, ensureAdmin, ensureUserForAdjac
},
selfHandleResponse: true,
on: {
proxyReq: (proxyReq, req, res) => {
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proxyReq.setHeader("X-Forwarded-Host", req.get("host"));
proxyReq.setHeader("X-Forwarded-Proto", req.headers["x-forwarded-proto"] || req.protocol);
},
proxyRes: createSwaggerInterceptor("stac", stacTarget),
},
})
Expand All @@ -47,6 +51,10 @@ function initAdjacentServersProxy(app, isDocker, ensureAdmin, ensureUserForAdjac
},
selfHandleResponse: true,
on: {
proxyReq: (proxyReq, req, res) => {
proxyReq.setHeader("X-Forwarded-Host", req.get("host"));
proxyReq.setHeader("X-Forwarded-Proto", req.headers["x-forwarded-proto"] || req.protocol);
},
proxyRes: createSwaggerInterceptor("tipg", tipgTarget),
},
})
Expand Down Expand Up @@ -85,6 +93,10 @@ function initAdjacentServersProxy(app, isDocker, ensureAdmin, ensureUserForAdjac
},
selfHandleResponse: true,
on: {
proxyReq: (proxyReq, req, res) => {
proxyReq.setHeader("X-Forwarded-Host", req.get("host"));
proxyReq.setHeader("X-Forwarded-Proto", req.headers["x-forwarded-proto"] || req.protocol);
},
proxyRes: createSwaggerInterceptor("titiler", titilerTarget),
},
})
Expand All @@ -109,6 +121,10 @@ function initAdjacentServersProxy(app, isDocker, ensureAdmin, ensureUserForAdjac
},
selfHandleResponse: true,
on: {
proxyReq: (proxyReq, req, res) => {
proxyReq.setHeader("X-Forwarded-Host", req.get("host"));
proxyReq.setHeader("X-Forwarded-Proto", req.headers["x-forwarded-proto"] || req.protocol);
},
proxyRes: createSwaggerInterceptor(
"titilerpgstac",
titilerpgstacTarget
Expand Down Expand Up @@ -272,10 +288,17 @@ const createSwaggerInterceptor = (path, target) => {
res.get("Content-Type").includes("html"))
) {
newResponse = newResponse || responseBuffer.toString("utf8");
newResponse = newResponse.replaceAll(
target,
`${req.protocol}://${req.get("host")}/${path}`
);
const { hostname: serviceHost, port: servicePort } = new URL(target);
const publicBase = `${req.protocol}://${req.get("host")}/${path}`;
// Replace port-qualified variants first to avoid partial matches on bare hostname
if (servicePort) {
newResponse = newResponse.replaceAll(`https://${serviceHost}:${servicePort}/`, `${publicBase}/`);
newResponse = newResponse.replaceAll(`https://${serviceHost}:${servicePort}`, publicBase);
}
newResponse = newResponse.replaceAll(`https://${serviceHost}/`, `${publicBase}/`);
newResponse = newResponse.replaceAll(`https://${serviceHost}`, publicBase);
newResponse = newResponse.replaceAll(`http://${serviceHost}/`, `${publicBase}/`);
newResponse = newResponse.replaceAll(target, publicBase);
}

return newResponse || finalReturn;
Expand Down
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