---
title: GET /upload-url
slug: content-marketing-platform/api/get-upload-url
docTags:
createdAt: 2026-10-01T18:51:26.265Z
---
{
"id": "7FH0_YmbN8Bg8HFLBmIs1",
"type": "api-oas-v2",
"data": {
"method": "GET",
"url": "https://api.cmp.optimizely.com/v3/upload-url",
"servers": [
{
"url": "https://api.cmp.optimizely.com/v3/upload-url",
"description": "v3 version of Optimizely CMP Open API"
}
],
"name": "GET /upload-url",
"description": "Get a presigned URL and related meta fields to upload a file. The validity time for this URL is 60 minutes.
",
"contentType": "application/json",
"request": {
"pathParameters": [],
"headerParameters": [
{
"name": "accept",
"type": "string",
"kind": "optional",
"description": "Generated from available response content types",
"enum": [
"application/json"
],
"default": "application/json"
}
],
"queryParameters": [],
"bodyDataParameters": [],
"formDataParameters": [],
"oAuthParameters": [
{
"id": "OAuth2",
"name": "OAuth2",
"kind": "optional",
"type": "oauth2",
"oauth2Flows": {
"clientCredentials": {
"tokenUrl": "https://accounts.cmp.optimizely.com/o/oauth2/v1/token",
"scopes": {}
},
"authorizationCode": {
"authorizationUrl": "https://accounts.cmp.optimizely.com/o/oauth2/v1/auth",
"tokenUrl": "https://accounts.cmp.optimizely.com/o/oauth2/v1/token",
"scopes": {
"openid": "Grants the ability to receive a unique identifier for the user.",
"profile": "Grants access to user profile information.",
"offline_access": "Grants the ability to refresh access_token using the refresh token even when user is not present (not logged in)."
}
}
},
"requiredScopes": [
"openid",
"profile",
"offline_access"
]
}
],
"cookieParameters": []
},
"responses": [
{
"statusCode": "200",
"description": "Fetched presigned upload URL and related meta fields",
"jsonExample": "",
"isExpanded": true,
"schema": [
{
"kind": "optional",
"type": "object",
"description": "",
"schema": [
{
"name": "url",
"kind": "required",
"type": "string",
"description": "Presigned URL to use for uploading a file with an HTTP POST request as multipart/form-data
",
"example": "https://cmp-files.s3-accelerate.amazonaws.com/"
},
{
"name": "upload_meta_fields",
"kind": "required",
"type": "object",
"description": "Related meta fields to upload a file. Items within this field must be sent along as paylod of the POST request, along with the file, to the presigned upload URL
",
"example": "",
"schema": [
{
"name": "key",
"kind": "required",
"type": "string",
"description": "Unique identifier of the file. This key will be needed for various file / attachment addition to different CMP resources using endpoints e.g. POST /v3/assets, POST /v3/campaigns/{id}/attachments etc.
",
"example": "ce8995aea58b11ea8cd90242ac120005"
},
{
"name": "policy",
"kind": "required",
"type": "string",
"description": "",
"example": "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"
},
{
"name": "x-amz-algorithm",
"kind": "required",
"type": "string",
"description": "",
"example": "AWS4-HMAC-SHA256"
},
{
"name": "x-amz-credential",
"kind": "required",
"type": "string",
"description": "",
"example": "ASIAAAAAAA3WO6D7RZFH/20343603/us-east-1/s3/aws4_request"
},
{
"name": "x-amz-date",
"kind": "required",
"type": "string",
"description": "",
"example": "20200603T151757Z"
},
{
"name": "x-amz-security-token",
"kind": "optional",
"type": "string",
"description": "",
"example": "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"
},
{
"name": "x-amz-signature",
"kind": "required",
"type": "string",
"description": "",
"example": "0e67ede744d4aed62aaaaaa8e87648b3e98a3e611ccccccc89963bcf70bd02f9"
}
]
}
],
"isExpanded": true
}
]
},
{
"statusCode": "400",
"description": "Client error",
"jsonExample": "",
"isExpanded": true,
"schema": [
{
"kind": "optional",
"type": "object",
"example": "{\"message\":\"Unsupported arguments: a,b,c\"}",
"description": "Error payload",
"customType": "Error",
"schema": [
{
"name": "message",
"kind": "required",
"type": "string",
"description": "Message describing the error",
"example": "Not found"
},
{
"name": "errors",
"kind": "optional",
"type": "map",
"description": "Additional information",
"example": "",
"customType": "map",
"schema": []
}
],
"modelRef": "#/components/schemas/Error",
"isExpanded": true
}
]
},
{
"statusCode": "401",
"description": "Authorization error",
"jsonExample": "",
"isExpanded": true,
"schema": [
{
"kind": "optional",
"type": "object",
"example": "{\"message\":\"Unauthorized\"}",
"description": "Error payload",
"customType": "Error",
"schema": [
{
"name": "message",
"kind": "required",
"type": "string",
"description": "Message describing the error",
"example": "Not found"
},
{
"name": "errors",
"kind": "optional",
"type": "map",
"description": "Additional information",
"example": "",
"customType": "map",
"schema": []
}
],
"modelRef": "#/components/schemas/Error",
"isExpanded": true
}
]
},
{
"statusCode": "403",
"description": "Permission error",
"jsonExample": "",
"isExpanded": true,
"schema": [
{
"kind": "optional",
"type": "object",
"example": "{\"message\":\"You do not have the permission to perform this operation\"}",
"description": "Error payload",
"customType": "Error",
"schema": [
{
"name": "message",
"kind": "required",
"type": "string",
"description": "Message describing the error",
"example": "Not found"
},
{
"name": "errors",
"kind": "optional",
"type": "map",
"description": "Additional information",
"example": "",
"customType": "map",
"schema": []
}
],
"modelRef": "#/components/schemas/Error",
"isExpanded": true
}
]
}
],
"hasXCodeSamples": false,
"examples": {
"languages": [
{
"id": "plc5TpA5WYbvoqHiR1ASM",
"language": "curl",
"label": "cURL",
"code": "curl --request GET \\\n --url https://api.cmp.optimizely.com/v3/upload-url \\\n --header 'accept: application/json'"
},
{
"id": "fTXrazwxwNn2oMVGuT8Qb",
"language": "javascript",
"label": "javascript",
"code": "var myHeaders = new Headers();\nmyHeaders.append(\"accept\", \"application/json\");\nmyHeaders.append(\"content-type\", \"application/json\");\n\nvar requestOptions = {\n method: 'GET',\n headers: myHeaders,\n redirect: 'follow'\n};\n\nfetch(\"https://api.cmp.optimizely.com/v3/upload-url\", requestOptions)\n .then(response => response.text())\n .then(result => console.log(result))\n .catch(error => console.log('error', error));"
},
{
"id": "1pQzCyFFM_2LFFcbS6VwG",
"language": "ruby",
"label": "Ruby",
"code": "require \"uri\"\nrequire \"json\"\nrequire \"net/http\"\n\nurl = URI(\"https://api.cmp.optimizely.com/v3/upload-url\")\n\nhttps = Net::HTTP.new(url.host, url.port)\nhttps.use_ssl = true\n\nrequest = Net::HTTP::Get.new(url)\nrequest[\"accept\"] = \"application/json\"\nrequest[\"content-type\"] = \"application/json\"\n\nresponse = https.request(request)\nputs response.read_body\n"
},
{
"id": "qpoDeZPdHqOg9rulQZELx",
"language": "python",
"label": "Python",
"code": "import requests\nimport json\n\nurl = \"https://api.cmp.optimizely.com/v3/upload-url\"\n\npayload = {}\nheaders = {\n 'accept': 'application/json',\n 'content-type': 'application/json'\n}\n\nresponse = requests.request(\"GET\", url, headers=headers, data=payload)\n\nprint(response.text)\n"
}
],
"selectedLanguageId": "plc5TpA5WYbvoqHiR1ASM"
},
"results": {
"languages": [
{
"id": "response-0-200",
"language": "200",
"code": "// Fetched presigned upload URL and related meta fields\n{\n \"url\": \"https://cmp-files.s3-accelerate.amazonaws.com/\",\n \"upload_meta_fields\": {\n \"key\": \"ce8995aea58b11ea8cd90242ac120005\",\n \"policy\": \"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\",\n \"x-amz-algorithm\": \"AWS4-HMAC-SHA256\",\n \"x-amz-credential\": \"ASIAAAAAAA3WO6D7RZFH/20343603/us-east-1/s3/aws4_request\",\n \"x-amz-date\": \"20200603T151757Z\",\n \"x-amz-security-token\": \"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\",\n \"x-amz-signature\": \"0e67ede744d4aed62aaaaaa8e87648b3e98a3e611ccccccc89963bcf70bd02f9\"\n }\n}"
},
{
"id": "response-1-400",
"language": "400",
"code": "// Client error\n{\n \"message\": \"Not found\",\n \"errors\": \"\"\n}"
},
{
"id": "response-2-401",
"language": "401",
"code": "// Authorization error\n{\n \"message\": \"Not found\",\n \"errors\": \"\"\n}"
},
{
"id": "response-3-403",
"language": "403",
"code": "// Permission error\n{\n \"message\": \"Not found\",\n \"errors\": \"\"\n}"
}
],
"selectedLanguageId": "response-0-200"
}
},
"children": [
{
"text": ""
}
]
}