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HTTP provides a uniform interface for interacting with a resource (Section 2), regardless of its type, nature, or implementation, via the manipulation and transfer of representations (Section 3).HTTP semantics include the intentions defined by each request method (Section 4), extensions to those semantics that might be described in request header fields (Section 5), the meaning of status codes to indicate a machine-readable response (Section 6), and the meaning of other control data and resource metadata that might be given in response header fields (Section 7).Status of This Memo This is an Internet Standards Track document.This document is a product of the Internet Engineering Task Force (IETF). It has received public review and has been approved for publication by the Internet Engineering Steering Group (IESG).Further information on Internet Standards is available in Section 2 of RFC 5741.Information about the current status of this document, any errata, and how to provide feedback on it may be obtained at When a request is received, the server reconstructs an effective request URI for the target resource (Section 5.5 of [RFC7230]).One design goal of HTTP is to separate resource identification from request semantics, which is made possible by vesting the request semantics in the request method (Section 4) and a few request-modifying header fields (Section 5).

Appendix D shows the collected grammar with all list operators expanded to standard ABNF notation.Audience Language ..................................13 3.1.4. Identification .....................................14 3.2. Representation Data .......................................17 3.3. Payload Semantics .........................................17 3.4. Content Negotiation .......................................18 3.4.1. Proactive Negotiation ..............................19 3.4.2. Reactive Negotiation ...............................20 4. Request Methods ................................................21 4.1. Overview ..................................................21 4.2. Common Method Properties ..................................22 4.2.1. Safe Methods .......................................22 4.2.2. Idempotent Methods .................................23 4.2.3. Cacheable Methods ..................................24 4.3. Method Definitions ........................................24 4.3.1. GET ................................................24 4.3.2. HEAD ...............................................25 4.3.3. POST ...............................................25 4.3.4. PUT ................................................26 4.3.5. DELETE .............................................29 4.3.6. CONNECT ............................................30 4.3.7. OPTIONS ............................................31 4.3.8. TRACE ..............................................32 5. Request Header Fields ..........................................33 5.1. Controls ..................................................33 5.1.1. Expect .............................................34 5.1.2. Max-Forwards .......................................36 5.2. Conditionals ..............................................36 5.3. Content Negotiation .......................................37 5.3.1. Quality Values .....................................37 5.3.2. Accept .............................................38 5.3.3. Accept-Charset .....................................40 5.3.4. Accept-Encoding ....................................41 5.3.5. Accept-Language ....................................42 5.4. Authentication Credentials ................................44 5.5. Request Context ...........................................44 5.5.1. From ...............................................44 5.5.2. Referer ............................................45 5.5.3. User-Agent .........................................46 6. Response Status Codes ..........................................47 6.1. Overview of Status Codes ..................................48 6.2. Informational 1xx .........................................50 6.2.1. 100 Continue .......................................50 6.2.2. 101 Switching Protocols ............................50 6.3. Successful 2xx ............................................51 6.3.1. 200 OK .............................................51 6.3.2. 201 Created ........................................52 6.3.3. 202 Accepted .......................................52 6.3.4. 203 Non-Authoritative Information ..................52 6.3.5. 204 No Content .....................................53 6.3.6. 205 Reset Content ..................................53 6.4. Redirection 3xx ...........................................54 6.4.1. 300 Multiple Choices ...............................55 6.4.2. 301 Moved Permanently ..............................56 6.4.3. 302 Found ..........................................56 6.4.4. 303 See Other ......................................57 6.4.5. 305 Use Proxy ......................................58 6.4.6. 306 (Unused) .......................................58 6.4.7. 307 Temporary Redirect .............................58 6.5. Client Error 4xx ..........................................58 6.5.1. 400 Bad Request ....................................58 6.5.2. 402 Payment Required ...............................59 6.5.3. 403 Forbidden ......................................59 6.5.4. 404 Not Found ......................................59 6.5.5. 405 Method Not Allowed .............................59 6.5.6. 406 Not Acceptable .................................60 6.5.7. 408 Request Timeout ................................60 6.5.8. 409 Conflict .......................................60 6.5.9. 410 Gone ...........................................60 6.5.10. 411 Length Required ...............................61 6.5.11. 413 Payload Too Large .............................61 6.5.12. 414 URI Too Long ..................................61 6.5.13. 415 Unsupported Media Type ........................62 6.5.14. 417 Expectation Failed ............................62 6.5.15. 426 Upgrade Required ..............................62 6.6. Server Error 5xx ..........................................62 6.6.1. 500 Internal Server Error ..........................63 6.6.2. 501 Not Implemented ................................63 6.6.3. 502 Bad Gateway ....................................63 6.6.4. 503 Service Unavailable ............................63 6.6.5. 504 Gateway Timeout ................................63 6.6.6. 505 HTTP Version Not Supported .....................64 7.Response Header Fields .........................................64 7.1. Control Data ..............................................64 ed 7.1.1. Origination Date ...................................65 7.1.2. Location ...........................................68 7.1.3. Retry-After ........................................69 7.1.4. Vary ...............................................70 7.2. Validator Header Fields ...................................71 7.3. Authentication Challenges .................................72 7.4. Response Context ..........................................72 7.4.1. Allow ..............................................72 7.4.2. Server .............................................73 8. IANA Considerations ............................................73 8.1. Method Registry ...........................................73 8.1.1. Procedure ..........................................74 8.1.2. Considerations for New Methods .....................74 8.1.3. Registrations ......................................75 8.2. Status Code Registry ......................................75 8.2.1. Procedure ..........................................75 8.2.2. Considerations for New Status Codes ................76 8.2.3.Disclosure of Fragment after Redirects ....................84 9.6.Disclosure of Product Information .........................84 9.7. Browser Fingerprinting ....................................84 10. Acknowledgments ...............................................85 11. References ....................................................85 11.1. Normative References .....................................85 11.2. Informative References ...................................86 Appendix A. Differences between HTTP and MIME .....................89 A.1.

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