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AWS Authentication fails with InvalidSignatureException

See original GitHub issue

Issue Description

I’m having trouble getting the AWS sigv4 authentication working as described in I keep getting a response like

The request signature we calculated does not match the signature you provided. Check your AWS Secret Access Key and signing method. Consult the service documentation for details.\n\nThe Canonical String for this request should have been …


I have two files, local.env and test.http




@awsUrl =

PUT {{awsUrl}}/echo
Authorization: AWS {{accessKeyId}} {{secretAccessKey}} token:{{sessionToken}}
content-type: application/json
{"message": "hello"}

What i’ve tried

  • I get the same issue if I substitute the variables from my environment into the test.http file
  • Verified the credentials work when I use awscurl (
  • tried adding region:us-west-2 and service:execute-api to the authorization line (didn’t change the outcome)

More detail

VS Code: 1.68.1 httpYac - Rest Client extension: v5.5.1

From the “httpyac - request” window, the outgoing request looks like this:

accept-encoding: gzip, deflate, br
accept: */*
authorization: AWS4-HMAC-SHA256 Credential=MY_KEY_HERE/20220623/us-west-2/execute-api/aws4_request, SignedHeaders=content-type;host;x-amz-date;x-amz-security-token, Signature=91cfc7b46d1466308423c2d2dfc62e5a48cd4d70db8faed7ab696167862f62dc
content-length: 20
content-type: application/json
user-agent: httpyac
x-amz-date: 20220623T075652Z
x-amz-security-token: MY_SESSION_TOKEN_HERE

{"message": "hello"}


HTTP/1.1 403  - Forbidden
connection: close
content-length: 1452
content-type: application/json
date: Thu, 23 Jun 2022 07:56:52 GMT
x-amzn-errortype: InvalidSignatureException
x-amzn-requestid: 77907a1c-6800-42dc-8887-6026a0d2e0da
x-amzn-trace-id: Root=1-62b41cc4-456a542c0def21f6652269f1

{"message":"The request signature we calculated does not match the signature you provided. Check your AWS Secret Access Key and signing method. Consult the service documentation for details.\n\nThe Canonical String for this request should have been\n'PUT\n/prod/echo\n\ncontent-type:application/json\\nx-amz-date:20220623T075652Z\nx-amz-security-token:MY_SESSION_TOKEN_HERE\n\ncontent-type;host;x-amz-date;x-amz-security-token\ncf8f644b80ee8100db6f910fa33514be8e0ac3d3f54546de914b34c2206ad6a9'\n\nThe String-to-Sign should have been\n'AWS4-HMAC-SHA256\n20220623T075652Z\n20220623/us-west-2/execute-api/aws4_request\n670c4c7ba89357df2e024e3b5e0b2d917b3c111ded27e856d42638cecbf8da09'\n"}

Issue Analytics

  • State:closed
  • Created 10 months ago
  • Comments:7 (3 by maintainers)

github_iconTop GitHub Comments

natemcmastercommented, Jun 26, 2022

Just tested and it’s working now. Thank you!

natemcmastercommented, Jun 23, 2022

Wow thanks for such a quick turn around. I am traveling without a laptop for a few days, but I will test it soon and let you know how it goes.

Read more comments on GitHub >

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