jiebi/CodeConvo huggingface dataset:
When a cache receives a <del> response and already has one or more stored </del> <ins> response, it needs to identify stored responses that are suitable for updating with the new information provided, and then do so. </ins> <del> responses for the applicable request URI, the cache needs to identify which (if any) are to be updated by the new information provided, and then do so. </del> <ins> The initial set of stored responses to update are those that could have been selected for that request -- i.e., those that meet the requirements in constructing.responses.from.caches, except the last requirement to be fresh, able to be served stale or just validated. </ins> <del> The stored response(s) to update are identified by using the first match (if any) of: </del> <ins> Then, that initial set of stored response(s) is further filtered by the first match of: </ins> For each stored response identified, the cache MUST update its header fields with the header fields provided in the
content, or poison a cache.  See security.considerations for security considerations regarding message routing. <ins> Unless the caveat above applies, an origin server MUST reject a request if any scheme-specific requirements are not met.  In particular, a request for an "https" resource MUST be rejected unless it has been received over a connection that has been secured via a certificate valid for that target URI's origin, as defined by https.uri. </ins> The status code in a response indicates that the origin server has
4.1. When a cache receives a request that can be satisfied by a stored <del> response that has a </del> <ins> response and that stored response contains a </ins> <del> header field (field.vary), it MUST NOT use that response unless all the selecting header fields nominated by the Vary header field match in both the original request (i.e., that associated with the stored response), and the presented request. </del> <ins> header field (field.vary), the cache MUST NOT use that stored response without revalidation unless all the selecting header fields (nominated by that Vary field value) in the present request match those fields in the original request (i.e., the request that caused the cached response to be stored). </ins> The selecting header fields from two requests are defined to match if and only if those in the first request can be transformed to those in
current_age is defined in age.calculations. Clients can send the max-age or min-fresh request directives (cache- <del> request-directive) to constrain or relax freshness calculations for the corresponding response.  However, caches are not required to </del> <ins> request-directive) to suggest limits on the freshness calculations for the corresponding response.  However, caches are not required to </ins> honor them. When calculating freshness, to avoid common problems in date parsing:
A cache can calculate the freshness lifetime (denoted as freshness_lifetime) of a response by using the first match of: <del> Note that this calculation is not vulnerable to clock skew, since all of the information comes from the origin server. </del> <ins> Note that this calculation is intended to reduce clock skew by using the clock information provided by the origin server whenever possible. </ins> When there is more than one value present for a given directive (e.g., two
authority component, an empty Host header field will be sent in this case. <del> To allow for the possibility of a transition to the absolute-form for all requests in some future version of HTTP, a server MUST accept the absolute-form in requests, even though HTTP/1.1 clients will only send them in requests to proxies. </del> <ins> A server MUST accept the absolute-form in requests even though most HTTP/1.1 clients will only send the absolute-form to a proxy. </ins> 3.2.3.
14.3. <del> The "Accept-Ranges" header field allows a server to indicate that it supports range requests for the target resource. </del> <ins> The "Accept-Ranges" field in a response indicates whether an upstream server supports range requests for the target resource. </ins> <del> An origin server that supports byte-range requests for a given target resource MAY send </del> <ins> For example, a server that supports byte.ranges can send the field </ins> <del> to indicate what range units are supported.  A client MAY generate range requests without having received this header field for the resource involved.  Range units are defined in range.units. </del> <ins> to indicate that it supports byte range requests for that target resource, thereby encouraging its use by the client for future partial requests on the same request path.  Range units are defined in range.units. A client MAY generate range requests regardless of having received an Accept-Ranges field.  The information only provides advice for the sake of improving performance and reducing unnecessary network transfers. Conversely, a client MUST NOT assume that receiving an Accept-Ranges field means that future range requests will return partial responses. The content might change, the server might only support range requests at certain times or under certain conditions, or a different intermediary might process the next request. </ins> A server that does not support any kind of range request for the target resource MAY send <del> to advise the client not to attempt a range request. </del> <ins> to advise the client not to attempt a range request on the same request path.  The range unit "none" is reserved for this purpose. The Accept-Ranges field MAY be sent in a trailer section, but is preferred to be sent as a header field because the information is particularly useful for restarting large information transfers that have failed in mid-content (before the trailer section is received). </ins> 14.4.
header field in the request (field.range). <del> A client SHOULD NOT generate content in a GET request.  Content received in a GET request has no defined semantics, cannot alter the meaning or target of the request, and might lead some implementations to reject the request and close the connection because of its potential as a request smuggling attack (request.smuggling). </del> <ins> Although request message framing is independent of the method used, content received in a GET request has no generally defined semantics, cannot alter the meaning or target of the request, and might lead some implementations to reject the request and close the connection because of its potential as a request smuggling attack (request.smuggling).  A client SHOULD NOT generate content in a GET request unless it is made directly to an origin server that has previously indicated, in or out of band, that such a request has a purpose and will be adequately supported.  An origin server SHOULD NOT rely on private agreements to receive content, since participants in HTTP communication are often unaware of intermediaries along the request chain. </ins> The response to a GET request is cacheable; a cache MAY use it to satisfy subsequent GET and HEAD requests unless otherwise indicated
and discarding the content for a HEAD request, since HEAD is usually requested for the sake of efficiency. <del> A client SHOULD NOT generate content in a HEAD request.  Content received in a HEAD request has no defined semantics, cannot alter the meaning or target of the request, and might lead some implementations to reject the request and close the connection because of its potential as a request smuggling attack (request.smuggling). </del> <ins> Although request message framing is independent of the method used, content received in a HEAD request has no generally defined semantics, cannot alter the meaning or target of the request, and might lead some implementations to reject the request and close the connection because of its potential as a request smuggling attack (request.smuggling).  A client SHOULD NOT generate content in a HEAD request unless it is made directly to an origin server that has previously indicated, in or out of band, that such a request has a purpose and will be adequately supported.  An origin server SHOULD NOT rely on private agreements to receive content, since participants in HTTP communication are often unaware of intermediaries along the request chain. </ins> The response to a HEAD request is cacheable; a cache MAY use it to satisfy subsequent HEAD requests unless otherwise indicated by the
If a DELETE method is successfully applied, the origin server SHOULD send <del> A client SHOULD NOT generate content in a DELETE request.  Content received in a DELETE request has no defined semantics, cannot alter the meaning or target of the request, and might lead some implementations to reject the request. </del> <ins> Although request message framing is independent of the method used, content received in a DELETE request has no generally defined semantics, cannot alter the meaning or target of the request, and might lead some implementations to reject the request and close the connection because of its potential as a request smuggling attack (request.smuggling).  A client SHOULD NOT generate content in a DELETE request unless it is made directly to an origin server that has previously indicated, in or out of band, that such a request has a purpose and will be adequately supported.  An origin server SHOULD NOT rely on private agreements to receive content, since participants in HTTP communication are often unaware of intermediaries along the request chain. </ins> Responses to the DELETE method are not cacheable.  If a successful DELETE request passes through a cache that has one or more stored
publication, only HTTP/1.1 uses transfer codings (see transfer.codings). <del> The TE field value consists of a list of tokens, each allowing for optional parameters (except for the special case "trailers"). </del> <ins> The TE field value is a list of members, with each member (aside from "trailers") consisting of a transfer coding name token with an optional weight indicating the client's relative preference for that transfer coding (quality.values) and optional parameters for that transfer coding. </ins> A sender of TE MUST also send a "TE" connection option within the
This allows a recipient to prepare for receipt of the indicated metadata before it starts processing the content. <del> For example, a sender might indicate that a message integrity check will be computed as the content is being streamed and provide the final signature as a trailer field.  This allows a recipient to perform the same check on the fly as it receives the content. </del> <ins> For example, a sender might indicate that a signature will be computed as the content is being streamed and provide the final signature as a trailer field.  This allows a recipient to perform the same check on the fly as it receives the content. </ins> Because the
pragma and cache-control directives, unless Cache-Control: no-cache is purposefully omitted to target other <del> response directives at HTTP/1.1 caches.  For example: </del> <ins> request directives at HTTP/1.1 caches.  For example: </ins> will constrain HTTP/1.1 caches to serve a response no older than 30 seconds, while precluding implementations that do not understand
consumes server resources. Furthermore, using multiple connections can cause undesirable side <del> effects in congested networks.  Using larger number of multiple connections can also cause side effects in otherwise uncongested networks, because their aggregate and initially synchronized sending behavior can cause congestion that would not have been present if fewer parallel connections had been used. </del> <ins> effects in congested networks.  Using larger numbers of connections can also cause side effects in otherwise uncongested networks, because their aggregate and initially synchronized sending behavior can cause congestion that would not have been present if fewer parallel connections had been used. </ins> Note that a server might reject traffic that it deems abusive or characteristic of a denial-of-service attack, such as an excessive
The status-code element is a 3-digit integer code describing the result of the server's attempt to understand and satisfy the client's <del> corresponding request.  The rest of the response message is to be interpreted in light of the semantics defined for that status code. See status.codes for information about the semantics of status codes, including the classes of status code (indicated by the first digit), the status codes defined by this specification, considerations for the definition of new status codes, and the IANA registry. </del> <ins> corresponding request.  A recipient parses and interprets the remainder of the response message in light of the semantics defined for that status code, if it is understood, or in accordance with the class of that status code indicated by its first digit if it is not. HTTP's core status codes are defined in status.codes, along with the classes of status codes, considerations for the definition of new status codes, and the IANA registry for collecting such definitions. </ins> The reason-phrase element exists for the sole purpose of providing a textual description associated with the numeric status code, mostly
received prior to the request-line. A sender MUST NOT send whitespace between the start-line and the <del> first header field.  A recipient that receives whitespace between the start-line and the first header field MUST either reject the message as invalid or consume each whitespace-preceded line without further processing of it (i.e., ignore the entire line, along with any subsequent lines preceded by whitespace, until a properly formed header field is received or the header section is terminated). The presence of such whitespace in a request might be an attempt to trick a server into ignoring that field line or processing the line after it as a new request, either of which might result in a security vulnerability if other implementations within the request chain interpret the same message differently.  Likewise, the presence of such whitespace in a response might be ignored by some clients or cause others to cease parsing. </del> <ins> first header field. A recipient that receives whitespace between the start-line and the first header field MUST either reject the message as invalid or consume each whitespace-preceded line without further processing of it (i.e., ignore the entire line, along with any subsequent lines preceded by whitespace, until a properly formed header field is received or the header section is terminated).  Rejection or removal of invalid whitespace-preceded lines is necessary to prevent their misinterpretation by downstream recipients that might be vulnerable to request smuggling (request.smuggling) or response splitting (response.splitting) attacks. </ins> When a server listening only for HTTP request messages, or processing what appears from the start-line to be an HTTP request message,
host name if the target URI contains a fully qualified domain name. A proxy MUST NOT modify the "absolute-path" and "query" parts of the <del> received target URI when forwarding it to the next inbound server, except as noted above to replace an empty path with "/" or "*". </del> <ins> received target URI when forwarding it to the next inbound server except as required by that forwarding protocol.  For example, a proxy forwarding a request to an origin server via HTTP/1.1 will replace an empty path with "/" (origin-form) or "*" (asterisk-form), depending on the request method. </ins> A proxy MUST NOT transform the content (content) of a message that contains a no-transform cache-control response directive
expectations, if any, can be defined within the field specification for a field intended for use in trailers. <ins> 6.6. Fields that describe the message itself, such as when and how the message has been generated, can appear in both requests and responses. 6.6.1. The "Date" header field represents the date and time at which the message was originated, having the same semantics as the Origination Date Field (orig-date) defined in RFC5322.  The field value is an HTTP-date, as defined in http.date. An example is A sender that generates a Date header field SHOULD generate its field value as the best available approximation of the date and time of message generation.  In theory, the date ought to represent the moment just before generating the message content.  In practice, a sender can generate the date value at any time during message origination. An origin server MUST NOT send a Date header field if it does not have a clock capable of providing a reasonable approximation of the current instant in Coordinated Universal Time.  An origin server MAY send a Date header field if the response is in the or class of status codes.  An origin server MUST send a Date header field in all other cases. A recipient with a clock that receives a response message without a Date header field MUST record the time it was received and append a corresponding Date header field to the message's header section if it is cached or forwarded downstream. A recipient with a clock that receives a response with an invalid Date header field value MAY replace that value with the time that response was received. A user agent MAY send a Date header field in a request, though generally will not do so unless it is believed to convey useful information to the server.  For example, custom applications of HTTP might convey a Date if the server is expected to adjust its interpretation of the user's request based on differences between the user agent and server clocks. 6.6.2. The "Trailer" header field provides a list of field names that the sender anticipates sending as trailer fields within that message. This allows a recipient to prepare for receipt of the indicated metadata before it starts processing the content. For example, a sender might indicate that a signature will be computed as the content is being streamed and provide the final signature as a trailer field.  This allows a recipient to perform the same check on the fly as it receives the content. A sender that intends to generate one or more trailer fields in a message SHOULD generate a header field in the header section of that message to indicate which fields might be present in the trailers. If an intermediary discards the trailer section in transit, the field could provide a hint of what metadata was lost, though there is no guarantee that a sender of Trailer will always follow through by sending the named fields. </ins> 7. HTTP request message routing is determined by each client based on
10.1.5. <del> The "Trailer" header field provides a list of field names that the sender anticipates sending as trailer fields within that message. This allows a recipient to prepare for receipt of the indicated metadata before it starts processing the content. For example, a sender might indicate that a signature will be computed as the content is being streamed and provide the final signature as a trailer field.  This allows a recipient to perform the same check on the fly as it receives the content. A sender that intends to generate one or more trailer fields in a message SHOULD generate a header field in the header section of that message to indicate which fields might be present in the trailers. If an intermediary discards the trailer section in transit, the field could provide a hint of what metadata was lost, though there is no guarantee that a sender of Trailer will always follow through by sending the named fields. 10.1.6. </del> The "User-Agent" header field contains information about the user agent originating the request, which is often used by servers to help identify the scope of reported interoperability problems, to work
10.2.2. <del> The "Date" header field represents the date and time at which the message was originated, having the same semantics as the Origination Date Field (orig-date) defined in RFC5322.  The field value is an HTTP-date, as defined in http.date. An example is A sender that generates a Date header field SHOULD generate its field value as the best available approximation of the date and time of message generation.  In theory, the date ought to represent the moment just before generating the message content.  In practice, a sender can generate the date value at any time during message origination. An origin server MUST NOT send a Date header field if it does not have a clock capable of providing a reasonable approximation of the current instant in Coordinated Universal Time.  An origin server MAY send a Date header field if the response is in the or class of status codes.  An origin server MUST send a Date header field in all other cases. A recipient with a clock that receives a response message without a Date header field MUST record the time it was received and append a corresponding Date header field to the message's header section if it is cached or forwarded downstream. A recipient with a clock that receives a response with an invalid Date header field value MAY replace that value with the time that response was received. A user agent MAY send a Date header field in a request, though generally will not do so unless it is believed to convey useful information to the server.  For example, custom applications of HTTP might convey a Date if the server is expected to adjust its interpretation of the user's request based on differences between the user agent and server clocks. 10.2.3. </del> The "Location" header field is used in some responses to refer to a specific resource in relation to the response.  The type of relationship is defined by the combination of request method and
12.5.5. The "Vary" header field in a response describes what parts of a <del> request message, aside from the method and target URI, might influence the origin server's process for selecting and representing </del> <ins> request message, aside from the method and target URI, might have influenced the origin server's process for selecting the content of </ins> this response. <del> A Vary field value is a list of request field names, known as the selecting header fields, that might have a role in selecting the representation for this response.  Potential selecting header fields are not limited to those defined by this specification. </del> <ins> A Vary field value is either the wildcard member "*" or a list of request field names, known as the selecting header fields, that might have had a role in selecting the representation for this response. Potential selecting header fields are not limited to fields defined by this specification. </ins> <del> If the list contains "*", it signals that other aspects of the request might play a role in selecting the response representation, possibly including elements outside the message syntax (e.g., the client's network address).  A recipient will not be able to determine whether this response is appropriate for a later request without forwarding the request to the origin server.  A proxy MUST NOT generate "*" in a Vary field value. </del> <ins> A list containing the member "*" signals that other aspects of the request might have played a role in selecting the response representation, possibly including aspects outside the message syntax (e.g., the client's network address).  A recipient will not be able to determine whether this response is appropriate for a later request without forwarding the request to the origin server.  A proxy MUST NOT generate "*" in a Vary field value. </ins> For example, a response that contains