diff --git a/README.md b/README.md
index a94c89c..f4d9ac6 100644
--- a/README.md
+++ b/README.md
@@ -55,8 +55,28 @@ Common options:
   --dry-run                   Show what would be done without making changes
   --log-level <level>         debug | info | warn | error (default: info)
   --output <format>           table | json (scan and status commands)
+  --http <port>               Use HTTP-01 challenge on the given port (run and renew only)
 ```
 
+### Challenge methods
+
+By default `run` and `renew` use **DNS-01** via Azure DNS (requires DNS Zone Contributor role).
+
+Pass `--http <port>` to use **HTTP-01** instead. The provisioner starts a temporary Express HTTP server on the given port and shuts it down after each certificate is issued. The server must be reachable from the internet on that port for the ACME CA to validate ownership.
+
+```sh
+# DNS-01 (default)
+azure-acme-provisioner run
+
+# HTTP-01 on port 80
+azure-acme-provisioner run --http 80
+
+# HTTP-01 on a non-privileged port (useful behind a reverse proxy or NAT rule)
+azure-acme-provisioner run --http 8080
+```
+
+> **Note:** Binding port 80 requires root privileges or `CAP_NET_BIND_SERVICE`. When running in Docker, map the host port to the container: `-p 80:8080` and pass `--http 8080`.
+
 ## Configuration
 
 All configuration is via environment variables. CLI flags override env vars when both are provided.
@@ -79,6 +99,7 @@ All configuration is via environment variables. CLI flags override env vars when
 | `ACME_RENEWAL_THRESHOLD_DAYS` | `30` | Renew certificates this many days before expiry |
 | `ACME_DNS_PROPAGATION_WAIT` | `60` | Maximum seconds to wait for DNS TXT record propagation |
 | `ACME_DNS_CHALLENGE_TTL` | `60` | TTL (seconds) for DNS-01 challenge TXT records |
+| `ACME_HTTP_PORT` | unset | If set to a positive integer, use HTTP-01 challenge on that port instead of DNS-01 |
 | `ACME_LOG_LEVEL` | `info` | Log level: `debug`, `info`, `warn`, `error` |
 | `ACME_SCHEDULE` | `0 0 2 * * *` | Azure Function timer schedule (cron expression, 6-field format). Only used when deployed as an Azure Function. |
 
diff --git a/package-lock.json b/package-lock.json
index bb3a1a6..e62af53 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "azure-acme-provisioner",
-  "version": "0.1.0",
+  "version": "0.2.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "azure-acme-provisioner",
-      "version": "0.1.0",
+      "version": "0.2.0",
       "license": "MIT",
       "dependencies": {
         "@azure/arm-dns": "^5.1.0",
@@ -16,12 +16,14 @@
         "@azure/keyvault-secrets": "^4.11.2",
         "@peculiar/x509": "^2.0.0",
         "acme-client": "^5.4.0",
-        "commander": "^14.0.0"
+        "commander": "^14.0.0",
+        "express": "^5.2.1"
       },
       "bin": {
         "azure-acme-provisioner": "dist/cli.js"
       },
       "devDependencies": {
+        "@types/express": "^5.0.6",
         "@types/node": "^24.0.0",
         "rimraf": "^6.1.3",
         "typescript": "^6.0.0"
@@ -610,6 +612,59 @@
         "node": ">=20.0.0"
       }
     },
+    "node_modules/@types/body-parser": {
+      "version": "1.19.6",
+      "resolved": "https://registry.npmjs.org/@types/body-parser/-/body-parser-1.19.6.tgz",
+      "integrity": "sha512-HLFeCYgz89uk22N5Qg3dvGvsv46B8GLvKKo1zKG4NybA8U2DiEO3w9lqGg29t/tfLRJpJ6iQxnVw4OnB7MoM9g==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/connect": "*",
+        "@types/node": "*"
+      }
+    },
+    "node_modules/@types/connect": {
+      "version": "3.4.38",
+      "resolved": "https://registry.npmjs.org/@types/connect/-/connect-3.4.38.tgz",
+      "integrity": "sha512-K6uROf1LD88uDQqJCktA4yzL1YYAK6NgfsI0v/mTgyPKWsX1CnJ0XPSDhViejru1GcRkLWb8RlzFYJRqGUbaug==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/node": "*"
+      }
+    },
+    "node_modules/@types/express": {
+      "version": "5.0.6",
+      "resolved": "https://registry.npmjs.org/@types/express/-/express-5.0.6.tgz",
+      "integrity": "sha512-sKYVuV7Sv9fbPIt/442koC7+IIwK5olP1KWeD88e/idgoJqDm3JV/YUiPwkoKK92ylff2MGxSz1CSjsXelx0YA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/body-parser": "*",
+        "@types/express-serve-static-core": "^5.0.0",
+        "@types/serve-static": "^2"
+      }
+    },
+    "node_modules/@types/express-serve-static-core": {
+      "version": "5.1.1",
+      "resolved": "https://registry.npmjs.org/@types/express-serve-static-core/-/express-serve-static-core-5.1.1.tgz",
+      "integrity": "sha512-v4zIMr/cX7/d2BpAEX3KNKL/JrT1s43s96lLvvdTmza1oEvDudCqK9aF/djc/SWgy8Yh0h30TZx5VpzqFCxk5A==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/node": "*",
+        "@types/qs": "*",
+        "@types/range-parser": "*",
+        "@types/send": "*"
+      }
+    },
+    "node_modules/@types/http-errors": {
+      "version": "2.0.5",
+      "resolved": "https://registry.npmjs.org/@types/http-errors/-/http-errors-2.0.5.tgz",
+      "integrity": "sha512-r8Tayk8HJnX0FztbZN7oVqGccWgw98T/0neJphO91KkmOzug1KkofZURD4UaD5uH8AqcFLfdPErnBod0u71/qg==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/@types/node": {
       "version": "24.12.4",
       "resolved": "https://registry.npmjs.org/@types/node/-/node-24.12.4.tgz",
@@ -620,6 +675,41 @@
         "undici-types": "~7.16.0"
       }
     },
+    "node_modules/@types/qs": {
+      "version": "6.15.1",
+      "resolved": "https://registry.npmjs.org/@types/qs/-/qs-6.15.1.tgz",
+      "integrity": "sha512-GZHUBZR9hckSUhrxmp1nG6NwdpM9fCunJwyThLW1X3AyHgd9IlHb6VANpQQqDr2o/qQp6McZ3y/IA2rVzKzSbw==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/@types/range-parser": {
+      "version": "1.2.7",
+      "resolved": "https://registry.npmjs.org/@types/range-parser/-/range-parser-1.2.7.tgz",
+      "integrity": "sha512-hKormJbkJqzQGhziax5PItDUTMAM9uE2XXQmM37dyd4hVM+5aVl7oVxMVUiVQn2oCQFN/LKCZdvSM0pFRqbSmQ==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/@types/send": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/@types/send/-/send-1.2.1.tgz",
+      "integrity": "sha512-arsCikDvlU99zl1g69TcAB3mzZPpxgw0UQnaHeC1Nwb015xp8bknZv5rIfri9xTOcMuaVgvabfIRA7PSZVuZIQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/node": "*"
+      }
+    },
+    "node_modules/@types/serve-static": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/@types/serve-static/-/serve-static-2.2.0.tgz",
+      "integrity": "sha512-8mam4H1NHLtu7nmtalF7eyBH14QyOASmcxHhSfEoRyr0nP/YdoesEtU+uSRvMe96TW/HPTtkoKqQLl53N7UXMQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/http-errors": "*",
+        "@types/node": "*"
+      }
+    },
     "node_modules/@typespec/ts-http-runtime": {
       "version": "0.3.5",
       "resolved": "https://registry.npmjs.org/@typespec/ts-http-runtime/-/ts-http-runtime-0.3.5.tgz",
@@ -634,6 +724,44 @@
         "node": ">=20.0.0"
       }
     },
+    "node_modules/accepts": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/accepts/-/accepts-2.0.0.tgz",
+      "integrity": "sha512-5cvg6CtKwfgdmVqY1WIiXKc3Q1bkRqGLi+2W/6ao+6Y7gu/RCwRuAhGEzh5B4KlszSuTLgZYuqFqo5bImjNKng==",
+      "license": "MIT",
+      "dependencies": {
+        "mime-types": "^3.0.0",
+        "negotiator": "^1.0.0"
+      },
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/accepts/node_modules/mime-db": {
+      "version": "1.54.0",
+      "resolved": "https://registry.npmjs.org/mime-db/-/mime-db-1.54.0.tgz",
+      "integrity": "sha512-aU5EJuIN2WDemCcAp2vFBfp/m4EAhWJnUNSSw0ixs7/kXbd6Pg64EmwJkNdFhB8aWt1sH2CTXrLxo/iAGV3oPQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/accepts/node_modules/mime-types": {
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/mime-types/-/mime-types-3.0.2.tgz",
+      "integrity": "sha512-Lbgzdk0h4juoQ9fCKXW4by0UJqj+nOOrI9MJ1sSj4nI8aI2eo1qmvQEie4VD1glsS250n15LsWsYtCugiStS5A==",
+      "license": "MIT",
+      "dependencies": {
+        "mime-db": "^1.54.0"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/express"
+      }
+    },
     "node_modules/acme-client": {
       "version": "5.4.0",
       "resolved": "https://registry.npmjs.org/acme-client/-/acme-client-5.4.0.tgz",
@@ -748,6 +876,30 @@
         "node": "18 || 20 || >=22"
       }
     },
+    "node_modules/body-parser": {
+      "version": "2.2.2",
+      "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-2.2.2.tgz",
+      "integrity": "sha512-oP5VkATKlNwcgvxi0vM0p/D3n2C3EReYVX+DNYs5TjZFn/oQt2j+4sVJtSMr18pdRr8wjTcBl6LoV+FUwzPmNA==",
+      "license": "MIT",
+      "dependencies": {
+        "bytes": "^3.1.2",
+        "content-type": "^1.0.5",
+        "debug": "^4.4.3",
+        "http-errors": "^2.0.0",
+        "iconv-lite": "^0.7.0",
+        "on-finished": "^2.4.1",
+        "qs": "^6.14.1",
+        "raw-body": "^3.0.1",
+        "type-is": "^2.0.1"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/express"
+      }
+    },
     "node_modules/brace-expansion": {
       "version": "5.0.6",
       "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-5.0.6.tgz",
@@ -782,6 +934,15 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/bytes": {
+      "version": "3.1.2",
+      "resolved": "https://registry.npmjs.org/bytes/-/bytes-3.1.2.tgz",
+      "integrity": "sha512-/Nf7TyzTx6S3yRJObOAV7956r8cr2+Oj8AC5dt8wSP3BQAoeX58NoHyCU8P8zGkNXStjTSi6fzO6F0pBdcYbEg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
     "node_modules/call-bind-apply-helpers": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/call-bind-apply-helpers/-/call-bind-apply-helpers-1.0.2.tgz",
@@ -795,6 +956,22 @@
         "node": ">= 0.4"
       }
     },
+    "node_modules/call-bound": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/call-bound/-/call-bound-1.0.4.tgz",
+      "integrity": "sha512-+ys997U96po4Kx/ABpBCqhA9EuxJaQWDQg7295H4hBphv3IZg0boBKuwYpt4YXp6MZ5AmZQnU/tyMTlRpaSejg==",
+      "license": "MIT",
+      "dependencies": {
+        "call-bind-apply-helpers": "^1.0.2",
+        "get-intrinsic": "^1.3.0"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
     "node_modules/combined-stream": {
       "version": "1.0.8",
       "resolved": "https://registry.npmjs.org/combined-stream/-/combined-stream-1.0.8.tgz",
@@ -816,6 +993,28 @@
         "node": ">=20"
       }
     },
+    "node_modules/content-disposition": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/content-disposition/-/content-disposition-1.1.0.tgz",
+      "integrity": "sha512-5jRCH9Z/+DRP7rkvY83B+yGIGX96OYdJmzngqnw2SBSxqCFPd0w2km3s5iawpGX8krnwSGmF0FW5Nhr0Hfai3g==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/express"
+      }
+    },
+    "node_modules/content-type": {
+      "version": "1.0.5",
+      "resolved": "https://registry.npmjs.org/content-type/-/content-type-1.0.5.tgz",
+      "integrity": "sha512-nTjqfcBFEipKdXCv4YDQWCfmcLZKm81ldF0pAopTvyrFGVbcR6P/VAAd5G7N+0tTr8QqiU0tFadD6FK4NtJwOA==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
     "node_modules/cookie": {
       "version": "0.7.2",
       "resolved": "https://registry.npmjs.org/cookie/-/cookie-0.7.2.tgz",
@@ -825,6 +1024,15 @@
         "node": ">= 0.6"
       }
     },
+    "node_modules/cookie-signature": {
+      "version": "1.2.2",
+      "resolved": "https://registry.npmjs.org/cookie-signature/-/cookie-signature-1.2.2.tgz",
+      "integrity": "sha512-D76uU73ulSXrD1UXF4KE2TMxVVwhsnCgfAyTg9k8P6KGZjlXKrOLe4dJQKI3Bxi5wjesZoFXJWElNWBjPZMbhg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=6.6.0"
+      }
+    },
     "node_modules/debug": {
       "version": "4.4.3",
       "resolved": "https://registry.npmjs.org/debug/-/debug-4.4.3.tgz",
@@ -891,6 +1099,15 @@
         "node": ">=0.4.0"
       }
     },
+    "node_modules/depd": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/depd/-/depd-2.0.0.tgz",
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+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.8"
+      }
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       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/dunder-proto/-/dunder-proto-1.0.1.tgz",
@@ -914,6 +1131,21 @@
         "safe-buffer": "^5.0.1"
       }
     },
+    "node_modules/ee-first": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/ee-first/-/ee-first-1.1.1.tgz",
+      "integrity": "sha512-WMwm9LhRUo+WUaRN+vRuETqG89IgZphVSNkdFgeb6sS/E4OrDIN7t48CAewSHXc6C8lefD8KKfr5vY61brQlow==",
+      "license": "MIT"
+    },
+    "node_modules/encodeurl": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/encodeurl/-/encodeurl-2.0.0.tgz",
+      "integrity": "sha512-Q0n9HRi4m6JuGIV1eFlmvJB7ZEVxu93IrMyiMsGC0lrMJMWzRgx6WGquyfQgZVb31vhGgXnfmPNNXmxnOkRBrg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
     "node_modules/es-define-property": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/es-define-property/-/es-define-property-1.0.1.tgz",
@@ -959,6 +1191,110 @@
         "node": ">= 0.4"
       }
     },
+    "node_modules/escape-html": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/escape-html/-/escape-html-1.0.3.tgz",
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+      "license": "MIT"
+    },
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+      "resolved": "https://registry.npmjs.org/etag/-/etag-1.8.1.tgz",
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+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/express": {
+      "version": "5.2.1",
+      "resolved": "https://registry.npmjs.org/express/-/express-5.2.1.tgz",
+      "integrity": "sha512-hIS4idWWai69NezIdRt2xFVofaF4j+6INOpJlVOLDO8zXGpUVEVzIYk12UUi2JzjEzWL3IOAxcTubgz9Po0yXw==",
+      "license": "MIT",
+      "dependencies": {
+        "accepts": "^2.0.0",
+        "body-parser": "^2.2.1",
+        "content-disposition": "^1.0.0",
+        "content-type": "^1.0.5",
+        "cookie": "^0.7.1",
+        "cookie-signature": "^1.2.1",
+        "debug": "^4.4.0",
+        "depd": "^2.0.0",
+        "encodeurl": "^2.0.0",
+        "escape-html": "^1.0.3",
+        "etag": "^1.8.1",
+        "finalhandler": "^2.1.0",
+        "fresh": "^2.0.0",
+        "http-errors": "^2.0.0",
+        "merge-descriptors": "^2.0.0",
+        "mime-types": "^3.0.0",
+        "on-finished": "^2.4.1",
+        "once": "^1.4.0",
+        "parseurl": "^1.3.3",
+        "proxy-addr": "^2.0.7",
+        "qs": "^6.14.0",
+        "range-parser": "^1.2.1",
+        "router": "^2.2.0",
+        "send": "^1.1.0",
+        "serve-static": "^2.2.0",
+        "statuses": "^2.0.1",
+        "type-is": "^2.0.1",
+        "vary": "^1.1.2"
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+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/express"
+      }
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+      "license": "MIT",
+      "engines": {
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+      "license": "MIT",
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+        "debug": "^4.4.0",
+        "encodeurl": "^2.0.0",
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+      "integrity": "sha512-DvEy55V3DB7uknRo+4iOGT5fP1slR8wQohVdknigZPMpMstaKJQWhwiYBACJE3Ul2pTnATihhBYnRhZQHGBiRw==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
+    "node_modules/toidentifier": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/toidentifier/-/toidentifier-1.0.1.tgz",
+      "integrity": "sha512-o5sSPKEkg/DIQNmH43V0/uerLrpzVedkUh8tGNvaeXpfpuwjKenlSox/2O/BTlZUtEe+JG7s5YhEz608PlAHRA==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.6"
+      }
+    },
     "node_modules/tslib": {
       "version": "2.8.1",
       "resolved": "https://registry.npmjs.org/tslib/-/tslib-2.8.1.tgz",
@@ -1513,6 +2246,62 @@
       "integrity": "sha512-Xni35NKzjgMrwevysHTCArtLDpPvye8zV/0E4EyYn43P7/7qvQwPh9BGkHewbMulVntbigmcT7rdX3BNo9wRJg==",
       "license": "0BSD"
     },
+    "node_modules/type-is": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/type-is/-/type-is-2.1.0.tgz",
+      "integrity": "sha512-faYHw0anBbc/kWF3zFTEnxSFOAGUX9GFbOBthvDdLsIlEoWOFOtS0zgCiQYwIskL9iGXZL3kAXD8OoZ4GmMATA==",
+      "license": "MIT",
+      "dependencies": {
+        "content-type": "^2.0.0",
+        "media-typer": "^1.1.0",
+        "mime-types": "^3.0.0"
+      },
+      "engines": {
+        "node": ">= 18"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/express"
+      }
+    },
+    "node_modules/type-is/node_modules/content-type": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/content-type/-/content-type-2.0.0.tgz",
+      "integrity": "sha512-j/O/d7GcZCyNl7/hwZAb606rzqkyvaDctLmckbxLzHvFBzTJHuGEdodATcP3yIRoDrLHkIATJuvzbFlp/ki2cQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/express"
+      }
+    },
+    "node_modules/type-is/node_modules/mime-db": {
+      "version": "1.54.0",
+      "resolved": "https://registry.npmjs.org/mime-db/-/mime-db-1.54.0.tgz",
+      "integrity": "sha512-aU5EJuIN2WDemCcAp2vFBfp/m4EAhWJnUNSSw0ixs7/kXbd6Pg64EmwJkNdFhB8aWt1sH2CTXrLxo/iAGV3oPQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/type-is/node_modules/mime-types": {
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/mime-types/-/mime-types-3.0.2.tgz",
+      "integrity": "sha512-Lbgzdk0h4juoQ9fCKXW4by0UJqj+nOOrI9MJ1sSj4nI8aI2eo1qmvQEie4VD1glsS250n15LsWsYtCugiStS5A==",
+      "license": "MIT",
+      "dependencies": {
+        "mime-db": "^1.54.0"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/express"
+      }
+    },
     "node_modules/typescript": {
       "version": "6.0.3",
       "resolved": "https://registry.npmjs.org/typescript/-/typescript-6.0.3.tgz",
@@ -1534,6 +2323,30 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/unpipe": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
+      "integrity": "sha512-pjy2bYhSsufwWlKwPc+l3cN7+wuJlK6uz0YdJEOlQDbl6jo/YlPi4mb8agUkVC8BF7V8NuzeyPNqRksA3hztKQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
+    "node_modules/vary": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
+      "integrity": "sha512-BNGbWLfd0eUPabhkXUVm0j8uuvREyTh5ovRa/dyow/BqAbZJyC+5fU+IzQOzmAKzYqYRAISoRhdQr3eIZ/PXqg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
+    "node_modules/wrappy": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+      "integrity": "sha512-l4Sp/DRseor9wL6EvV2+TuQn63dMkPjZ/sp9XkghTEbV9KlPS1xUsZ3u7/IQO4wxtcFB4bgpQPRcR3QCvezPcQ==",
+      "license": "ISC"
+    },
     "node_modules/wsl-utils": {
       "version": "0.1.0",
       "resolved": "https://registry.npmjs.org/wsl-utils/-/wsl-utils-0.1.0.tgz",
diff --git a/package.json b/package.json
index e6d7ea1..e428af9 100644
--- a/package.json
+++ b/package.json
@@ -1,13 +1,13 @@
 {
   "name": "azure-acme-provisioner",
-  "version": "0.1.0",
+  "version": "0.2.0",
   "author": {
     "name": "Sławomir Koszewski",
     "url": "https://github.com/skoszewski"
   },
   "licenses": [
     {
-      "type":"MIT",
+      "type": "MIT",
       "url": "https://opensource.org/licenses/MIT"
     }
   ],
@@ -44,9 +44,11 @@
     "@azure/keyvault-secrets": "^4.11.2",
     "@peculiar/x509": "^2.0.0",
     "acme-client": "^5.4.0",
-    "commander": "^14.0.0"
+    "commander": "^14.0.0",
+    "express": "^5.2.1"
   },
   "devDependencies": {
+    "@types/express": "^5.0.6",
     "@types/node": "^24.0.0",
     "rimraf": "^6.1.3",
     "typescript": "^6.0.0"
diff --git a/src/cli.ts b/src/cli.ts
index bbed00b..91b768c 100644
--- a/src/cli.ts
+++ b/src/cli.ts
@@ -24,6 +24,7 @@ function applyOverrides(options: Record<string, unknown>): void {
   if (options['email']) process.env['ACME_CONTACT_EMAIL'] = String(options['email']);
   if (options['renewalThreshold']) process.env['ACME_RENEWAL_THRESHOLD_DAYS'] = String(options['renewalThreshold']);
   if (options['logLevel']) process.env['ACME_LOG_LEVEL'] = String(options['logLevel']);
+  if (options['http']) process.env['ACME_HTTP_PORT'] = String(options['http']);
 }
 
 const sharedOptions = (cmd: Command): Command =>
@@ -44,6 +45,7 @@ sharedOptions(
   program
     .command('run', { isDefault: true })
     .description('Scan DNS zones and issue or renew certificates')
+    .option('--http <port>', 'Use HTTP-01 challenge on the given port instead of DNS-01')
     .option('--dry-run', 'Show what would be done without making changes')
 ).action(async (options: Record<string, unknown>) => {
   applyOverrides(options);
@@ -104,6 +106,7 @@ sharedOptions(
   program
     .command('renew <domain>')
     .description('Force-renew a certificate for a specific domain, bypassing the renewal threshold')
+    .option('--http <port>', 'Use HTTP-01 challenge on the given port instead of DNS-01')
 ).action(async (domain: string, options: Record<string, unknown>) => {
   applyOverrides(options);
   const config = loadConfig();
diff --git a/src/index.ts b/src/index.ts
index ffb3c7f..30c1a72 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -3,9 +3,13 @@ export type { Config } from './lib/config.js';
 
 export { KeyVaultStore } from './lib/keyvault.js';
 
+export type { ChallengeHandler, AcmeAuthz, AcmeChallenge } from './lib/challenge.js';
+
 export { scanDnsZones, DnsChallengeManager } from './lib/dns.js';
 export type { DomainRecord } from './lib/dns.js';
 
+export { HttpChallengeServer } from './lib/http-challenge.js';
+
 export { AcmeClient } from './lib/acme.js';
 export type { IssuedCertificate } from './lib/acme.js';
 
diff --git a/src/lib/acme.ts b/src/lib/acme.ts
index 927a3d5..da9beb3 100644
--- a/src/lib/acme.ts
+++ b/src/lib/acme.ts
@@ -1,7 +1,6 @@
 import * as acme from 'acme-client';
-import { promises as dns } from 'node:dns';
+import { ChallengeHandler } from './challenge.js';
 import { Config } from './config.js';
-import { DnsChallengeManager } from './dns.js';
 import { KeyVaultStore } from './keyvault.js';
 
 const ACCOUNT_KEY_SECRET = 'acme-account-private-key';
@@ -58,7 +57,7 @@ export class AcmeClient {
 
   async orderCertificate(
     domains: string[],
-    challengeManager: DnsChallengeManager
+    handler: ChallengeHandler
   ): Promise<IssuedCertificate> {
     if (!this.client) throw new Error('Call ensureAccount() before ordering certificates');
 
@@ -68,19 +67,12 @@ export class AcmeClient {
 
     const certificatePem = await this.client.auto({
       csr,
-      challengePriority: ['dns-01'],
-      challengeCreateFn: async (_authz, _challenge, keyAuthorization) => {
-        const domain = _authz.identifier.value;
-        const txtFqdn = `_acme-challenge.${domain}`;
-        this.log(`Creating DNS TXT record: ${txtFqdn}`);
-        await challengeManager.createTxtRecord(txtFqdn, keyAuthorization);
-        await this.waitForDnsPropagation(txtFqdn, keyAuthorization);
+      challengePriority: [handler.challengeType],
+      challengeCreateFn: async (authz, challenge, keyAuthorization) => {
+        await handler.create(authz, challenge, keyAuthorization);
       },
-      challengeRemoveFn: async (_authz, _challenge, _keyAuthorization) => {
-        const domain = _authz.identifier.value;
-        const txtFqdn = `_acme-challenge.${domain}`;
-        this.log(`Removing DNS TXT record: ${txtFqdn}`);
-        await challengeManager.deleteTxtRecord(txtFqdn);
+      challengeRemoveFn: async (authz, challenge, keyAuthorization) => {
+        await handler.remove(authz, challenge, keyAuthorization);
       },
     });
 
@@ -94,29 +86,4 @@ export class AcmeClient {
       chainPem: chainCerts.join(''),
     };
   }
-
-  private async waitForDnsPropagation(fqdn: string, expectedValue: string): Promise<void> {
-    const deadline = Date.now() + this.config.dnsPropagationWaitSeconds * 1000;
-    const pollInterval = 5000;
-
-    while (Date.now() < deadline) {
-      try {
-        const records = await dns.resolveTxt(fqdn);
-        const found = records.flat().includes(expectedValue);
-        if (found) {
-          this.log(`DNS propagation confirmed for ${fqdn}`);
-          return;
-        }
-      } catch {
-        // record not yet visible
-      }
-      await sleep(pollInterval);
-    }
-
-    this.log(`DNS propagation wait timed out for ${fqdn}, proceeding anyway`);
-  }
-}
-
-function sleep(ms: number): Promise<void> {
-  return new Promise(resolve => setTimeout(resolve, ms));
 }
diff --git a/src/lib/challenge.ts b/src/lib/challenge.ts
new file mode 100644
index 0000000..50a5dbb
--- /dev/null
+++ b/src/lib/challenge.ts
@@ -0,0 +1,13 @@
+export interface AcmeAuthz {
+  identifier: { value: string };
+}
+
+export interface AcmeChallenge {
+  token: string;
+}
+
+export interface ChallengeHandler {
+  readonly challengeType: 'dns-01' | 'http-01';
+  create(authz: AcmeAuthz, challenge: AcmeChallenge, keyAuthorization: string): Promise<void>;
+  remove(authz: AcmeAuthz, challenge: AcmeChallenge, keyAuthorization: string): Promise<void>;
+}
diff --git a/src/lib/config.ts b/src/lib/config.ts
index 5cd135f..508f0d3 100644
--- a/src/lib/config.ts
+++ b/src/lib/config.ts
@@ -9,6 +9,7 @@ export interface Config {
   dnsPropagationWaitSeconds: number;
   dnsChallengeTtl: number;
   logLevel: 'debug' | 'info' | 'warn' | 'error';
+  httpChallengePort?: number;
 }
 
 export class ConfigError extends Error {
@@ -67,5 +68,6 @@ export function loadConfig(): Config {
     dnsPropagationWaitSeconds: optionalEnvInt('ACME_DNS_PROPAGATION_WAIT', 60),
     dnsChallengeTtl: optionalEnvInt('ACME_DNS_CHALLENGE_TTL', 60),
     logLevel: logLevel as Config['logLevel'],
+    httpChallengePort: optionalEnvInt('ACME_HTTP_PORT', 0) || undefined,
   };
 }
diff --git a/src/lib/dns.ts b/src/lib/dns.ts
index 52df557..09f5b60 100644
--- a/src/lib/dns.ts
+++ b/src/lib/dns.ts
@@ -1,5 +1,7 @@
 import { DnsManagementClient } from '@azure/arm-dns';
 import { TokenCredential } from '@azure/identity';
+import { promises as dnsPromises } from 'node:dns';
+import { AcmeAuthz, AcmeChallenge, ChallengeHandler } from './challenge.js';
 import { Config } from './config.js';
 
 export interface DomainRecord {
@@ -61,14 +63,34 @@ function isAcmeTagged(tags: Record<string, string> | undefined): boolean {
   return val === 'true' || val === 'enabled';
 }
 
-export class DnsChallengeManager {
+export class DnsChallengeManager implements ChallengeHandler {
+  readonly challengeType = 'dns-01' as const;
   private readonly client: DnsManagementClient;
-  private zoneMap: Map<string, string> | undefined; // zone name → resource group
+  private zoneMap: Map<string, string> | undefined;
 
-  constructor(credential: TokenCredential, private readonly config: Config) {
+  constructor(
+    credential: TokenCredential,
+    private readonly config: Config,
+    private readonly log: (msg: string) => void
+  ) {
     this.client = new DnsManagementClient(credential, config.subscriptionId);
   }
 
+  async create(authz: AcmeAuthz, _challenge: AcmeChallenge, keyAuthorization: string): Promise<void> {
+    const domain = authz.identifier.value;
+    const txtFqdn = `_acme-challenge.${domain}`;
+    this.log(`Creating DNS TXT record: ${txtFqdn}`);
+    await this.createTxtRecord(txtFqdn, keyAuthorization);
+    await this.waitForPropagation(txtFqdn, keyAuthorization);
+  }
+
+  async remove(authz: AcmeAuthz, _challenge: AcmeChallenge, _keyAuthorization: string): Promise<void> {
+    const domain = authz.identifier.value;
+    const txtFqdn = `_acme-challenge.${domain}`;
+    this.log(`Removing DNS TXT record: ${txtFqdn}`);
+    await this.deleteTxtRecord(txtFqdn);
+  }
+
   async createTxtRecord(fqdn: string, value: string): Promise<void> {
     const { resourceGroup, zone, name } = await this.resolveFqdn(fqdn);
     await this.client.recordSets.createOrUpdate(resourceGroup, zone, name, 'TXT', {
@@ -86,6 +108,26 @@ export class DnsChallengeManager {
     }
   }
 
+  private async waitForPropagation(fqdn: string, expectedValue: string): Promise<void> {
+    const deadline = Date.now() + this.config.dnsPropagationWaitSeconds * 1000;
+    const pollInterval = 5000;
+
+    while (Date.now() < deadline) {
+      try {
+        const records = await dnsPromises.resolveTxt(fqdn);
+        if (records.flat().includes(expectedValue)) {
+          this.log(`DNS propagation confirmed for ${fqdn}`);
+          return;
+        }
+      } catch {
+        // record not yet visible
+      }
+      await sleep(pollInterval);
+    }
+
+    this.log(`DNS propagation wait timed out for ${fqdn}, proceeding anyway`);
+  }
+
   private async loadZoneMap(): Promise<Map<string, string>> {
     if (this.zoneMap) return this.zoneMap;
 
@@ -103,7 +145,6 @@ export class DnsChallengeManager {
   private async resolveFqdn(fqdn: string): Promise<{ resourceGroup: string; zone: string; name: string }> {
     const zones = await this.loadZoneMap();
 
-    // longest-suffix match: find the most specific zone that is a suffix of fqdn
     let bestZone = '';
     for (const zoneName of zones.keys()) {
       if (
@@ -123,3 +164,7 @@ export class DnsChallengeManager {
     return { resourceGroup, zone: bestZone, name };
   }
 }
+
+function sleep(ms: number): Promise<void> {
+  return new Promise(resolve => setTimeout(resolve, ms));
+}
diff --git a/src/lib/http-challenge.ts b/src/lib/http-challenge.ts
new file mode 100644
index 0000000..47afb5f
--- /dev/null
+++ b/src/lib/http-challenge.ts
@@ -0,0 +1,53 @@
+import * as http from 'node:http';
+import express from 'express';
+import { AcmeAuthz, AcmeChallenge, ChallengeHandler } from './challenge.js';
+
+export class HttpChallengeServer implements ChallengeHandler {
+  readonly challengeType = 'http-01' as const;
+  private readonly tokens = new Map<string, string>();
+  private server: http.Server | undefined;
+
+  constructor(
+    private readonly port: number,
+    private readonly log: (msg: string) => void
+  ) {}
+
+  async create(_authz: AcmeAuthz, challenge: AcmeChallenge, keyAuthorization: string): Promise<void> {
+    this.tokens.set(challenge.token, keyAuthorization);
+    if (!this.server) await this.start();
+  }
+
+  async remove(_authz: AcmeAuthz, challenge: AcmeChallenge, _keyAuthorization: string): Promise<void> {
+    this.tokens.delete(challenge.token);
+    if (this.tokens.size === 0) await this.stop();
+  }
+
+  private start(): Promise<void> {
+    return new Promise((resolve, reject) => {
+      const app = express();
+      app.get('/.well-known/acme-challenge/:token', (req, res) => {
+        const keyAuth = this.tokens.get(req.params['token']);
+        if (keyAuth) {
+          res.type('text/plain').send(keyAuth);
+        } else {
+          res.status(404).send('Not found');
+        }
+      });
+      this.server = app.listen(this.port, () => {
+        this.log(`HTTP-01 challenge server listening on port ${this.port}`);
+        resolve();
+      });
+      this.server.once('error', reject);
+    });
+  }
+
+  private stop(): Promise<void> {
+    return new Promise((resolve, reject) => {
+      if (!this.server) { resolve(); return; }
+      this.server.close(err => {
+        this.server = undefined;
+        if (err) reject(err); else resolve();
+      });
+    });
+  }
+}
diff --git a/src/lib/provisioner.ts b/src/lib/provisioner.ts
index c5c8dc3..6a52183 100644
--- a/src/lib/provisioner.ts
+++ b/src/lib/provisioner.ts
@@ -1,7 +1,9 @@
 import { DefaultAzureCredential } from '@azure/identity';
 import { AcmeClient } from './acme.js';
+import { ChallengeHandler } from './challenge.js';
 import { Config } from './config.js';
 import { DnsChallengeManager, DomainRecord, scanDnsZones } from './dns.js';
+import { HttpChallengeServer } from './http-challenge.js';
 import { KeyVaultStore } from './keyvault.js';
 
 export interface ProvisioningResult {
@@ -17,7 +19,7 @@ export class Provisioner {
   private readonly credential: DefaultAzureCredential;
   private _store: KeyVaultStore | undefined;
   private _acme: AcmeClient | undefined;
-  private _challengeManager: DnsChallengeManager | undefined;
+  private _challengeHandler: ChallengeHandler | undefined;
 
   constructor(
     private readonly config: Config,
@@ -46,11 +48,13 @@ export class Provisioner {
     return this._acme;
   }
 
-  private get challengeManager(): DnsChallengeManager {
-    if (!this._challengeManager) {
-      this._challengeManager = new DnsChallengeManager(this.credential, this.config);
+  private get challengeHandler(): ChallengeHandler {
+    if (!this._challengeHandler) {
+      this._challengeHandler = this.config.httpChallengePort
+        ? new HttpChallengeServer(this.config.httpChallengePort, (msg) => this.log(msg))
+        : new DnsChallengeManager(this.credential, this.config, (msg) => this.log(msg));
     }
-    return this._challengeManager;
+    return this._challengeHandler;
   }
 
   async run(dryRun = false): Promise<ProvisioningResult> {
@@ -99,7 +103,7 @@ export class Provisioner {
         }
 
         const fqdns = group.map(d => d.fqdn);
-        const issued = await this.acme.orderCertificate(fqdns, this.challengeManager);
+        const issued = await this.acme.orderCertificate(fqdns, this.challengeHandler);
         const pemBundle = issued.privateKeyPem + issued.certificatePem + issued.chainPem;
         await this.store.importCertificate(certName, pemBundle);