Migration - Upgrades

How to Migrate ColdFusion API Endpoints to New URLs

by Aaron Longnion
9 min read
Contents show

Introduction

Migrating API endpoints to new URLs is more than a cosmetic change—it’s about maintainability, Scalability, and Security. As your ColdFusion application evolves, you may need clearer endpoint naming, versioning, better URL routing, and compatibility with API Gateways or load balancers. A well-planned Migration reduces Technical debt, improves REST semantics, simplifies documentation, and preserves client integrations through carefully managed redirects and deprecation policies.

Prerequisites / Before You Start

  • Backups and Version control
  • Environment and version alignment
    • Confirm ColdFusion server versions across environments (e.g., CF2021/2023).
    • Confirm JDK compatibility.
    • Check Tomcat connector Configuration (AJP/HTTP) and versions.
  • Dependency inventory
    • Identify all consumers of the current API (internal services, external partners, mobile apps, SDKs).
    • Inventory libraries handling auth (OAuth/JWT), logging, Rate limiting, and CORS.
  • Documentation baseline
    • Export current Postman collections or OpenAPI/Swagger specs.
    • Generate an inventory of all live endpoints and HTTP methods.
  • Infrastructure and routing
  • Testing and monitoring
    • Tools: Postman/Newman, cURL, JMeter/Gatling.
    • Centralized logging (e.g., ELK, Splunk) and metrics (Prometheus/Grafana).
  • Security and Compliance
    • Validate TLS configuration (HSTS if appropriate).
    • Review WAF rules and IP whitelisting/blacklisting.
  • Rollback plan
    • Define a clear rollback process and downtime window if needed.
    • Prepare release notes for internal teams and clients.

Step-by-Step Migration guide

1) Inventory and Map Old-to-New Endpoints

  • Gather all current endpoints, for example:
    • /api/v1/users (GET/POST)
    • /api/v1/users/{id} (GET/PUT/DELETE)
  • Define the target structure (e.g., moving toward resource clarity or new versioning):
    • /services/v2/accounts
    • /services/v2/accounts/{id}
  • Create a mapping document that includes:
    • Old URL → New URL
    • Method support
    • Required header changes
    • Query/path parameter transformations
See also  How to Reduce Risk During Large ColdFusion Migrations

This document becomes your golden source for rewrites, redirects, and client communication.

2) Decide Versioning and Deprecation Strategy

  • Prefer path-based versioning (e.g., /v1, /v2) for clarity and cache friendliness.
  • For GET endpoints, plan 301 (Moved Permanently) redirects if you genuinely deprecate old URLs; otherwise use 302/307 for temporary migration.
  • For non-idempotent requests (POST, PUT, DELETE):
    • Use 307/308 to preserve method and body across redirects.
  • Publish a deprecation policy with a “Sunset” date and provide a timeline (e.g., v1 supported for 6 months after v2 GA).

3) Design the New URL Schema

  • Follow RESTful conventions and consistent naming:
    • Nouns for resources: /accounts, /transactions
    • Plural forms, lowercase, hyphenated sub-resources if needed
  • Include pagination and filtering patterns:
    • /services/v2/accounts?limit=50&offset=0&status=active
  • Reserve space for future expansion:
    • /services/v2/accounts/{id}/settings

4) Update ColdFusion REST Components (CFCs)

If you use ColdFusion’s built-in REST:

  • Mark CFCs with rest=”true” and define restPath:

component rest=”true” restPath=”accounts” produces=”application/json” consumes=”application/json” {

remote any function listAccounts()
httpmethod=”GET”
restPath=””
{
// your code here
}

remote any function getAccount(required string id)
httpmethod=”GET”
restPath=”{id}”
{
// your code here
}
}

  • Ensure the REST application root is registered. You can do this programmatically:

component {

this.name = “MyCFApp”;
this.mappings[“/app”] = expandPath(“/app”);
this.restSettings = {
cfclocation = [ expandPath(“/app/services/v2”) ],
skipCFCwithError = true,
serviceMapping = “/services/v2”
};

public boolean function onApplicationStart() {
restInitApplication( expandPath(“/app/services/v2”), “/services/v2” );
return true;
}
}

  • If you previously exposed /api/v1, register /services/v2 in parallel so both can run during migration.

5) Introduce a Front Controller or Routing Layer (If Not Using REST)

If your app relies on SES-style URLs routed through index.cfm, add logic to map new paths:

public boolean function onRequestStart(required string targetPage) {
var uri = cgi.path_info;
if (left(uri, 8) eq “/api/v1”) {
// Redirect or rewrite internally
// 307 preserves method for non-GET
if (cgi.request_method eq “GET”) {
cfheader(statuscode=”301″, statustext=”Moved Permanently”);
} else {
cfheader(statuscode=”307″, statustext=”Temporary Redirect”);
}
cfheader(name=”Location”, value=replace(uri, “/api/v1”, “/services/v2”, “one”));
cfabort;
}
return true;
}

This pattern centralizes URL routing while you refactor controllers.

6) Configure Web Server Rewrite Rules

Implement rewrites at the web server or reverse proxy to reduce ColdFusion load and ensure correct URL routing.

  • Apache (.htaccess or virtual host):

RewriteEngine On

Preserve query strings

RewriteCond %{REQUEST_URI} ^/api/v1/(.*)$ [NC]

GET -> 301

RewriteCond %{REQUEST_METHOD} =GET
RewriteRule ^api/v1/(.*)$ /services/v2/$1 [R=301,L,QSA]

Non-GET -> 307

RewriteCond %{REQUEST_METHOD} !(GET)
RewriteRule ^api/v1/(.*)$ /services/v2/$1 [R=307,L,QSA]

  • IIS (web.config):






















  • If using Nginx as reverse proxy:

location ~ ^/api/v1/(.*)$ {
if ($request_method = GET) {
return 301 /services/v2/$1$is_args$args;
}
return 307 /services/v2/$1$is_args$args;
}

7) Preserve Backward compatibility with Response Headers

Add deprecation signals to old endpoints so clients see what’s changing:




These headers can be paired with email notices or portal banners.

8) Update Auth, CORS, and Security

  • If URL paths change, confirm your OAuth scopes or JWT audience claims still validate.
  • Update CORS allowed origins and allowed paths:
See also  How to Handle ORM Schema Changes in Migration



  • Maintain or enhance WAF rules, IP restrictions, and Rate limiting at gateway/load balancer.
  • Review HSTS, CSP, and secure cookies for the new endpoints.

9) Regenerate Documentation and SDKs

  • Update OpenAPI/Swagger:
    • Ensure tags, schemas, examples, and error codes reflect new paths.
  • Regenerate client SDKs if you provide them (TypeScript/Java/Python).
  • Provide migration notes in the docs and code examples for each endpoint change.

10) Implement Observability for the Cutover

  • Log correlation IDs to trace redirected calls:

<cfset corrId = structKeyExists(cgi, “HTTP_X_CORRELATION_ID”) ? cgi.HTTP_X_CORRELATION_ID : createUUID()>



  • Metrics to track
    • Redirect rates (old vs new endpoints)
    • Error rates (4xx/5xx)
    • Latency percentiles (P50/P95/P99)
    • Throughput (RPS/QPS)
  • Dashboards and alerts should be in place prior to the switch.

11) Choose a Rollout Strategy

  • Blue-Green Deployment
    • Stand up v2 alongside v1, route a small percentage of traffic via load balancer rules.
  • Canary Release
    • Gradually increase traffic to the new URLs; monitor error/latency thresholds.
  • Shadow Traffic
    • Mirror requests to v2 without impacting client responses; compare outputs where feasible.
  • Feature Flags
    • Enable the v2 path internally first, then expand to external clients.

12) Test Thoroughly

  • Functional testing with Postman/Newman:

newman run ./collections/api-v2.postman_collection.json -e ./envs/staging.postman_environment.json

  • cURL smoke tests:

curl -I -X GET https://example.com/api/v1/users
curl -I -X GET https://example.com/services/v2/accounts
curl -i -X POST https://example.com/api/v1/users -d ‘{“name”:”Liz”}’ -H “Content-Type: application/json”

  • Performance testing with JMeter/Gatling to validate connectors and thread pools (Tomcat maxThreads, IIS queue length).
  • Security testing of auth flows, CORS preflight (OPTIONS), and rate limiting.

13) Update Connectors and Server settings (If Needed)

  • Verify ColdFusion-Tomcat connector (isapi_redirect/mod_jk or modern AJP/HTTP) mapping still matches new context paths.
  • Review Tomcat’s server.xml for connector settings that may affect Performance:
    • maxThreads
    • keepAliveTimeout
    • connectionTimeout
  • Ensure CF mappings (this.mappings) align with new directories.

14) Data and Cache Considerations

  • Validate that endpoints expecting different parameters don’t break existing stored procedures or ORM mappings.
  • Invalidate caches (EHCache/Redis/CDN) when moving to new resource paths to avoid stale responses.
  • Ensure idempotency where required, especially when retrying requests during rollout.

Risks, Common Issues, and How to Avoid Them

  • Misapplied Redirect Codes
    • Risk: Using 301 for POST leads to method loss in some clients.
    • Avoidance: Use 307/308 for non-GET methods.
  • CORS Failures After URL Change
    • Risk: OPTIONS preflight blocked on new path.
    • Avoidance: Update CORS rules and verify with browser Dev tools.
  • Broken Client Integrations
    • Risk: SDKs and embedded URLs not updated.
    • Avoidance: Provide a comprehensive Migration guide and test with real client apps.
  • Cache/SEO Side Effects
    • Risk: Caches pin old endpoints; 404s appear in search engines.
    • Avoidance: Use appropriate 301 for GET resources, set cache-control headers, update sitemaps if applicable.
  • Logging Gaps
    • Risk: Lack of correlation prevents Debugging.
    • Avoidance: Enforce X-Correlation-ID across all requests and responses.
  • Connector Misconfiguration
    • Risk: 502/503 under load due to thread exhaustion.
    • Avoidance: Load test and tune Tomcat/IIS/Apache connectors before full rollout.
  • Security Drift
    • Risk: Relaxed rules while “testing.”
    • Avoidance: Apply the same or stricter security controls at the new paths; review WAF signatures.
See also  How to Migrate ColdFusion Sessions During Server Switch

Post-Migration Checklist

  • Endpoint accessibility
    • All new URLs return expected status and payloads.
    • Old URLs redirect correctly with preserved query strings and methods.
  • Monitoring and logs
    • Alerts are green; no spikes in 4xx/5xx rates.
    • Correlation IDs appear in logs for both old and new paths.
  • Performance
    • Latency and throughput meet or exceed Pre-migration baselines.
    • No connector thread starvation; GC pauses within acceptable bounds.
  • Security
    • OAuth/JWT validation works; scopes unchanged or properly migrated.
    • CORS preflights succeed; HSTS/CSP remain intact.
  • Documentation and communications
    • OpenAPI/Swagger updated; Postman collections published.
    • Client teams notified; SDKs released and versioned.
  • Infrastructure validation
    • Load balancer and gateway rules updated and documented.
    • CDN and cache invalidation completed; TTLs verified.
  • Cleanup plan
    • Schedule removal of v1 routes after deprecation window.
    • Archive Legacy code paths and configs.

Practical Examples and Snippets

Example: Redirect GET with 301 and Others with 307 in Application.cfc

public boolean function onRequestStart(required string targetPage) {
var uri = cgi.path_info;
if (refindNoCase(“^/api/v1/”, uri)) {
var newUri = rereplace(uri, “^/api/v1/”, “/services/v2/”);
if (cgi.request_method eq “GET”) {
cfheader(statuscode=”301″, statustext=”Moved Permanently”);
} else {
cfheader(statuscode=”307″, statustext=”Temporary Redirect”);
}
cfheader(name=”Location”, value=”#newUri#?#cgi.query_string#”);
cfabort;
}
return true;
}

Example: ColdFusion REST Registration on the Fly

restDeleteApplication(“/services/v2”);
restInitApplication(expandPath(“/app/services/v2”), “/services/v2”);

Mapping Old Resource Names to New Ones

  • Legacy: /api/v1/users
  • New: /services/v2/accounts
  • Parameter parity:
    • users/{id} → accounts/{id}
    • users?role=admin → accounts?type=admin

Recommended Redirect Status Codes by Method

  • GET, HEAD: 301 (permanent), 302 (temporary) as needed
  • POST, PUT, PATCH, DELETE: 307 or 308 to preserve method and body
  • OPTIONS: Typically no redirect; handle in place for CORS compatibility

Tooling Tips

  • Use Postman monitors or Newman in CI to validate both old and new path behavior post-deploy.
  • Set up synthetic checks (Pingdom/UptimeRobot) for critical endpoints.
  • Compare payload schemas pre- and post-migration using contract tests (e.g., Pact) if applicable.

FAQ

How long should I keep old endpoints active?

Maintain old endpoints for at least one full release cycle, ideally 90–180 days, depending on your client update cadence. During this window, return deprecation headers and provide clear migration instructions.

Puis-je utiliser seulement des règles de réécriture sans changer le code ColdFusion?

Yes, for simple path changes. However, if payloads, headers, or Authentication behavior change, you should update your ColdFusion CFCs/controllers and version your API explicitly rather than relying solely on rewrites.

What is the best way to test that redirects preserve request bodies?

Use cURL or Postman to send POST/PUT/DELETE requests with a payload to the old URL and confirm the server receives the same body at the new URL. Ensure you use 307/308 redirects in your web server rules.

Do I need to rebuild my OpenAPI/Swagger specification?

If any paths, parameters, response schemas, or auth flows changed, you must update the specification. Publishing an accurate spec is crucial for client SDK generation and for API Gateways that rely on the contract.

About the author

Aaron Longnion

Aaron Longnion

Hey there! I'm Aaron Longnion — an Internet technologist, web software engineer, and ColdFusion expert with more than 24 years of experience. Over the years, I've had the privilege of working with some of the most exciting and fast-growing companies out there, including lynda.com, HomeAway, landsofamerica.com (CoStar Group), and Adobe.com.

I'm a full-stack developer at heart, but what really drives me is designing and building internet architectures that are highly scalable, cost-effective, and fault-tolerant — solutions built to handle rapid growth and stay ahead of the curve.

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