> ## Documentation Index > Fetch the complete documentation index at: https://developers.authlete.com/llms.txt > Use this file to discover all available pages before exploring further. # Using DPoP > Technical guide on implementing DPoP with Authlete APIs for supporting OAuth 2.0 Proof-of-Possession. ## Preface This article describes how to support "[RFC 9449: OAuth 2.0 Demonstrating Proof-of-Possession (DPoP)](https://www.rfc-editor.org/rfc/rfc9449) " with Authlete APIs. > This feature is available in Authlete version 2.2 or later. ## Instructions Authorization servers and resource servers support DPoP by following these steps. 1. Receiving a request that includes a "DPoP Proof JWT" * A endpoint (EP) of an authorization server (e.g., Token EP, PAR EP, UserInfo EP) or a resource server receives a request, with "DPoP Proof JWT" as one of HTTP headers, from a client. 2. Extracting DPoP-related information * The server extracts DPoP-related information (DPoP Proof JWT, HTTP method and HTTP target URI) from the request. 3. Making a request to Authlete's APIs * The server make a request, that includes the content of the client's request and the above DPoP-related information as request parameters,  to Authlete APIs (/auth/token, /auth/introspection, etc.) *** ## Example The following is an example of how to support DPoP in an authorization server's token EP. dpop *DPoP support on token EP* ### 1. Receiving a request that includes a "DPoP Proof JWT" Let us assume that the authorization server's token EP receives the following HTTP request. (wrapped for readability) ``` POST /token HTTP/1.1 Host: as.example.com DPoP: eyJ0eXAiOiJkcG9wK2p3dCIsImFsZyI6IlJTMjU2IiwiandrIjp7Imt0eSI6IlJ JTQSIsImUiOiJBUUFCIiwidXNlIjoic2lnIiwia2lkIjoib3A4cTNIaUNPVHQtej BmUE1kanZsV21WN2QwS2FxVG9xcDNlZF9wdHA1QSIsImFsZyI6IlJTMjU2Iiwibi I6ImdadHZ5VmRCb1ZEVTZHVTFLOGE2eHphb2EwR0F6dE9wcG1zRVZFN1NDZFpjT2 9WanpURlNRSnBXa0RQQmktNzBmeHdtc041c016Q3RPeXZ1Sk5XcFk5RHFUb0lWYX bXM2VJOFRIU3dNNnZ0bXpNSWt5WDY0RXdZb2VuN2twbkhtZ3VDWUZ6dWxLM2FKZz JKWFpOWXl1YTFuTTRmSGs3TnA0UlhTYmFBb2p5THR0SVFCSXZpOFVPcVI1dEYwaXZ CQzRKSGxnUDVZTjNjTjIxOEFqeTVmcHFJdi1naE0zcmhtZjJuZFNpWnU2R3JPNmdP OXFyaE05NXJRcEprSDlMcmdQaEE2ZkhQWVB3WnR5dEpBVGNVd1FWTThKTmwybTFWR zlXS1o0SjdTTGJxdVNNNUZ4b29Oekc2dmZBWlhWLTBVTVBqSU5TZ3dJMDdBYi1Ocn ZBUHNKUSJ9fQ.eyJqdGkiOiItQndDM0VTYzZhY2MybFRjIiwiaHRtIjoiUE9TVCIsIm h0dSI6Imh0dHBzOi8vYXMuZXhhbXBsZS5jb20vdG9rZW4iLCJpYXQiOjE2NzkzMDg3 NDN9.VOoyMJVR5RwyOWDGF42Oc_AElsGf6x2ZLW-X Y8g8xXbH7WMdGKeSY0Mm8YIXblviyBCgD0y6oQH07Ds5uEtH0GSO15z5brawJmivr UyiIiaH6UK2GKE42HNHrQ29Ln66cEqbDYxizN4hfu9yqoQgGEw6oRhiQaOLDLyzGE QQRMkDPEz2LwhfsUhSzWPjtyhj2WBobH5WaNCybo6SBI2eGj1Pj97PdREK0luR7rn 3AU_N-PtIDFNeXbtYjRcE6NNrfSCWcrkLcuOHuKgPv61-OuqQ0jRbLpkyhTWjxtmj zOuzWspfvg8ln8bOaw_y4VOspvUL5FBGI6P-RXBlBUrKow ... grant_type=authorization_code&scope=read& redirect_uri={redirect_uri}&code={code}&client_id={client_id} ``` ### 2. Extracting DPoP-related information The authorization server detects a DPoP header in the request, and extracts HTTP method, HTTP target URI and DPoP Proof JWT. These values are then included in a request to Authlete's [/auth/token](/api-reference/token-endpoint/process-token-request) API, as `htm`, `htu` and `dpop` respectively. The following table shows the values in this example. | Item | Value | | --------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | Method (htm) | POST | | Target URI (htu) | [https://as.example.com/token](https://as.example.com/token) | | DPoP Proof JWT (dpop) | `eyJ0eXAiOiJkcG9wK2p3dCIsImFsZyI6IlJTMjU2IiwidHlwIjoiYXQrand0In0.eyJraWQiOiJvOGpsc1IydXBkcnRjZ280NU5CejFrdDJ6aWg4cHNKV09KUU1lQ3E5OVdGIiwic2lnbmF0dXJlIjoiZ3Z0MmFNRXJsV0RqVk5ST3U1WlA4R2h3dnBJa0tLVTRjN3hwU1ZyT3ciLCJlbmMiOiJBMjU2R0NNIiwia2lkIjoib3A4cTNIaUNPVHQtejBmUE1kanZsV21WN2QwS2FxVG9xcDNlZF9wdHA1USJ9.eyJqdGkiOiItQndDM0VTYzZhY2MybFRjIiwiaHRtIjoiUE9TVCIsImh0dSI6Imh0dHBzOi8vYXMuZXhhbXBsZS5jb20vdG9rZW4iLCJpYXQiOjE2NzkzMDg3NDN9.VOoyMJVR5RwyOWDGF42Oc_AElsGf6x2ZLW-X Y8g8xXbH7WMdGKeSY0Mm8YIXblviyBCgD0y6oQH07Ds5uEtH0GSO15z5brawJmivrU yiIiaH6UK2GKE42HNHrQ29Ln66cEqbDYxizN4hfu9yqoQgGEw6oRhiQaOLDLyzGEQQRMKB PEz2LwhfsUhSzWPjtyhj2WBobH5WaNCybo6SBI2eGj1Pj97PdREK0luR7rn3AU_N-PtI DFNeXbtYjRcE6NNrfSCWcrkLcuOHuKgPv61-OuqQ0jRbLpkyhTWjxtmjzOuzWspfvg8l n8bOaw_y4VOspvUL5FBGI6P-RXBlBUrKow` | ### 3. Making a request to Authlete's APIs The following is a request body from the authorization server to the [/auth/token](/api-reference/token-endpoint/process-token-request) API. ``` { "parameters": "grant_type=authorization_code&scope=read& redirect_uri={redirect_uri}&code={code}&client_id={client_id}", "htm":"POST", "htu":"https://as.example.com/token", "dpop":"eyJ0eXAiOiJkcG9wK2p3dCIsImFsZyI6IlJTMjU2IiwiandrIjp7Imt0eSI6IlJTQSIs ImUiOiJBUUFCIiwidXNlIjoic2lnIiwia2lkIjoib3A4cTNIaUNPVHQtejBmUE1kanZs V21WN2QwS2FxVG9xcDNlZF9wdHA1QSIsImFsZyI6IlJTMjU2IiwibiI6ImdadHZ5VmRC b1ZEVTZHVTFLOGE2eHphb2EwR0F6dE9wcG1zRVZFN1NDZFpjT29WanpURlNRSnBXa0RQ QmktNzBmeHdtc041c016Q3RPeXZ1Sk5XcFk5RHFUb0lWYXBXM2VJOFRIU3dNNnZ0bXpN SWt5WDY0RXdZb2VuN2twbkhtZ3VDWUZ6dWxLM2FKZzJKWFpOWXl1YTFuTTRmSGs3TnA0 UlhTYmFBb2p5THR0SVFCSXZpOFVPcVI1dEYwaXZCQzRKSGxnUDVZTjNjTjIxOEFqeTVm cHFJdi1naE0zcmhtZjJuZFNpWnU2R3JPNmdPOXFyaE05NXJRcEprSDlMcmdQaEE2ZkhQ WVB3WnR5dEpBVGNVd1FWTThKTmwybTFWRzlXS1o0SjdTTGJxdVNNNUZ4b29Oekc2dmZB WlhWLTBVTVBqSU5TZ3dJMDdBYi1OcnZBUHNKUSJ9fQ.eyJqdGkiOiItQndDM0VTYzZhY 2MybFRjIiwiaHRtIjoiUE9TVCIsImh0dSI6Imh0dHBzOi8vYXMuZXhhbXBsZS5jb20vd G9rZW4iLCJpYXQiOjE2NzkzMDg3NDN9.VOoyMJVR5RwyOWDGF42Oc_AElsGf6x2ZLW-X Y8g8xXbH7WMdGKeSY0Mm8YIXblviyBCgD0y6oQH07Ds5uEtH0GSO15z5brawJmivrUyi IiaH6UK2GKE42HNHrQ29Ln66cEqbDYxizN4hfu9yqoQgGEw6oRhiQaOLDLyzGEQQRMkB PEz2LwhfsUhSzWPjtyhj2WBobH5WaNCybo6SBI2eGj1Pj97PdREK0luR7rn3AU_N-PtI DFNeXbtYjRcE6NNrfSCWcrkLcuOHuKgPv61-OuqQ0jRbLpkyhTWjxtmjzOuzWspfvg8l n8bOaw_y4VOspvUL5FBGI6P-RXBlBUrKow" } ``` Authlete returns the following response if the above request is successful. ``` { "type": "tokenResponse", "resultCode": "A050001", "resultMessage": "[A050001] The token request (grant_type=authorization_code) was processed successfully.", "accessToken": "{access_token}", "action": "OK", "responseContent": { "access_token": "{access_token}", "scope": "read", "token_type": "DPoP", "expires_in": 60 }, ... } ``` The authorization server will then return a token response to the client with responseContent as its body. ## Further Reading * [Illustrated DPoP (OAuth Access Token Security Enhancement)](https://darutk.medium.com/illustrated-dpop-oauth-access-token-security-enhancement-801680d761ff)