jiebi/CodeConvo huggingface dataset:
7.4. <del> The "TE" header field in a request indicates what transfer codings, besides chunked, the client is willing to accept in response, and whether or not the client is willing to accept trailer fields in a chunked transfer coding. </del> <ins> The TE field (field.te) is used in HTTP/1.1 to indicate what transfer-codings, besides chunked, the client is willing to accept in the response, and whether or not the client is willing to accept trailer fields in a chunked transfer coding. </ins> <del> The TE field-value consists of a list of transfer coding names, each allowing for optional parameters (as described in transfer.codings), and/or the keyword "trailers".  A client MUST NOT send the chunked transfer coding name in TE; chunked is always acceptable for HTTP/1.1 recipients. </del> <ins> A client MUST NOT send the chunked transfer coding name in TE; chunked is always acceptable for HTTP/1.1 recipients. </ins> Three examples of TE use are below.
header field in the header section of that message to indicate which fields might be present in the trailers. <ins> 4.6.4. The "TE" header field in a request can be used to indicate that the sender will not discard trailer fields when it contains a "trailers" member, as described in trailer.fields. Additionally, specific HTTP versions can use it to indicate the transfer codings the client is willing to accept in the response. The TE field-value consists of a list of tokens, each allowing for optional parameters (as described in parameter). </ins> 4.7. See field.names for a general requirements for field names, and
The <del> status code indicates that none of the ranges in the request's header field (field.range) overlap the current extent of the or that the set of ranges requested has been rejected due to invalid ranges or an excessive request of small or overlapping ranges. </del> <ins> status code indicates that the set of ranges in the request's </ins> <del> For byte ranges, failing to overlap the current extent means that the </del> <ins> header field (field.range) has been rejected either because none of the requested ranges are satisfiable or because the client has requested an excessive number of small or overlapping ranges (a potential denial of service attack). </ins> <del> of all of the </del> <ins> Each range unit defines what is required for its own range sets to be satisfiable.  For example, byte.ranges defines what makes a bytes range set satisfiable. </ins> <del> values were greater than or equal to the current length of the selected representation.  When this status code is generated in response to a byte-range request, the sender SHOULD generate a </del> <ins> When this status code is generated in response to a byte-range request, the sender SHOULD generate a </ins> header field specifying the current length of the selected representation (field.content-range).
production can be transmitted either as a token or within a quoted- string.  The quoted and unquoted values are equivalent. <ins> 4.4.1.5. Prior to 1995, there were three different formats commonly used by servers to communicate timestamps.  For compatibility with old implementations, all three are defined here.  The preferred format is a fixed-length and single-zone subset of the date and time specification used by the Internet Message Format RFC5322. An example of the preferred format is Examples of the two obsolete formats are A recipient that parses a timestamp value in an HTTP field MUST accept all three HTTP-date formats.  When a sender generates a field that contains one or more timestamps defined as HTTP-date, the sender MUST generate those timestamps in the IMF-fixdate format. An HTTP-date value represents time as an instance of Coordinated Universal Time (UTC).  The first two formats indicate UTC by the three-letter abbreviation for Greenwich Mean Time, "GMT", a predecessor of the UTC name; values in the asctime format are assumed to be in UTC.  A sender that generates HTTP-date values from a local clock ought to use NTP (RFC5905) or some similar protocol to synchronize its clock to UTC. Preferred format: Obsolete formats: HTTP-date is case sensitive.  A sender MUST NOT generate additional whitespace in an HTTP-date beyond that specifically included as SP in the grammar.  The semantics of , , , , and are the same as those defined for the Internet Message Format constructs with the corresponding name (RFC5322). Recipients of a timestamp value in rfc850-date format, which uses a two-digit year, MUST interpret a timestamp that appears to be more than 50 years in the future as representing the most recent year in the past that had the same last two digits. Recipients of timestamp values are encouraged to be robust in parsing timestamps unless otherwise restricted by the field definition.  For example, messages are occasionally forwarded over HTTP from a non- HTTP source that might generate any of the date and time specifications defined by the Internet Message Format. </ins> 4.5. A #rule extension to the ABNF rules of RFC5234 is used to improve
10.1.1. <del> 10.1.1.1. Prior to 1995, there were three different formats commonly used by servers to communicate timestamps.  For compatibility with old implementations, all three are defined here.  The preferred format is a fixed-length and single-zone subset of the date and time specification used by the Internet Message Format RFC5322. An example of the preferred format is Examples of the two obsolete formats are A recipient that parses a timestamp value in an HTTP field MUST accept all three HTTP-date formats.  When a sender generates a field that contains one or more timestamps defined as HTTP-date, the sender MUST generate those timestamps in the IMF-fixdate format. An HTTP-date value represents time as an instance of Coordinated Universal Time (UTC).  The first two formats indicate UTC by the three-letter abbreviation for Greenwich Mean Time, "GMT", a predecessor of the UTC name; values in the asctime format are assumed to be in UTC.  A sender that generates HTTP-date values from a local clock ought to use NTP (RFC5905) or some similar protocol to synchronize its clock to UTC. Preferred format: Obsolete formats: HTTP-date is case sensitive.  A sender MUST NOT generate additional whitespace in an HTTP-date beyond that specifically included as SP in the grammar.  The semantics of , , , , and are the same as those defined for the Internet Message Format constructs with the corresponding name (RFC5322). Recipients of a timestamp value in rfc850-date format, which uses a two-digit year, MUST interpret a timestamp that appears to be more than 50 years in the future as representing the most recent year in the past that had the same last two digits. Recipients of timestamp values are encouraged to be robust in parsing timestamps unless otherwise restricted by the field definition.  For example, messages are occasionally forwarded over HTTP from a non- HTTP source that might generate any of the date and time specifications defined by the Internet Message Format. 10.1.1.2. </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
The "Vary" header field in a response describes what parts of a request message, aside from the method, Host header field, and target URI, might influence the origin server's process for selecting and <del> representing this response.  The value consists of either a single asterisk ("*") or a list of header field names (case-insensitive). A Vary field value of "*" signals that anything about 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 a Vary field with a "*" value. A Vary field value consisting of a list of field names indicates that the named request header fields, known as the selecting header fields, might have a role in selecting the representation.  The potential selecting header fields are not limited to those defined by this specification. </del> <ins> representing this response. 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. 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. </ins> For example, a response that contains
1. <del> The Hypertext Transfer Protocol (HTTP) is a stateless application- level request/response protocol that uses extensible semantics and self-descriptive messages for flexible interaction with network-based hypertext information systems.  HTTP is defined by a series of documents that collectively form the HTTP/1.1 specification: HTTP is a generic interface protocol for information systems.  It is designed to hide the details of how a service is implemented by presenting a uniform interface to clients that is independent of the types of resources provided.  Likewise, servers do not need to be aware of each client's purpose: an HTTP request can be considered in isolation rather than being associated with a specific type of client or a predetermined sequence of application steps.  The result is a protocol that can be used effectively in many different contexts and for which implementations can evolve independently over time. HTTP is also designed for use as an intermediation protocol for translating communication to and from non-HTTP information systems. HTTP proxies and gateways can provide access to alternative information services by translating their diverse protocols into a hypertext format that can be viewed and manipulated by clients in the same way as HTTP services. </del> <ins> 1.1. The Hypertext Transfer Protocol (HTTP) is a family of stateless, application-level, request/response protocols that use a generic interface, extensible semantics, and self-descriptive messages to enable flexible interaction with network-based hypertext information systems. HTTP hides the details of how a service is implemented by presenting a uniform interface to clients that is independent of the types of resources provided.  Likewise, servers do not need to be aware of each client's purpose: a request can be considered in isolation rather than being associated with a specific type of client or a predetermined sequence of application steps.  This allows general- purpose implementations to be used effectively in many different contexts, reduces interaction complexity, and enables independent evolution over time. HTTP is also designed for use as an intermediation protocol, wherein proxies and gateways can translate non-HTTP information systems into a more generic interface. </ins> One consequence of this flexibility is that the protocol cannot be defined in terms of what occurs behind the interface.  Instead, we
11.1.4. The "Vary" header field in a response describes what parts of a <del> request message, aside from the method, Host header field, and target URI, might influence the origin server's process for selecting and representing this response. </del> <ins> request message, aside from the method and target URI, might influence the origin server's process for selecting and representing this response. </ins> 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
(in order of precedence): Since there is no way to distinguish a successfully completed, close- <del> delimited message from a partially received message interrupted by network failure, a server SHOULD generate encoding or length- delimited messages whenever possible.  The close-delimiting feature exists primarily for backwards compatibility with HTTP/1.0. </del> <ins> delimited response message from a partially received message interrupted by network failure, a server SHOULD generate encoding or length-delimited messages whenever possible.  The close-delimiting feature exists primarily for backwards compatibility with HTTP/1.0. </ins> A server MAY reject a request that contains a message body but not a
It is unknown whether the reset problem is exclusive to TCP or might also be found in other transport connection protocols. <ins> Note that a TCP connection that is half-closed by the client does not delimit a request message, nor does it imply that the client is no longer interested in a response.  In general, transport signals cannot be relied upon to signal edge cases, since HTTP/1.1 is independent of transport. </ins> 9.7. TLS provides a facility for secure connection closure.  When a valid
If-Match is most often used with state-changing methods (e.g., POST, PUT, DELETE) to prevent accidental overwrites when multiple user agents might be acting in parallel on the same resource (i.e., to <del> prevent the "lost update" problem).  It can also be used with safe methods to abort a request if the </del> <ins> prevent the "lost update" problem).  It can also be used with any method to abort a request if the </ins> <del> does not match one already stored (or partially stored) from a prior request. </del> <ins> does not match one that the client has already stored (or partially stored) from a prior request. </ins> An origin server that receives an If-Match header field MUST evaluate the condition as per evaluation prior to performing the method.
To evaluate a received If-Match header field: An origin server MUST NOT perform the requested method if a received <del> If-Match condition evaluates to false; instead, the origin server MUST respond with either a) the status code or b) one of the status codes if the origin server has verified that a state change is being requested and the final state is already reflected in the current state of the target resource (i.e., the change requested by the user agent has already succeeded, but the user agent might not be aware of it, perhaps because the prior response was lost or a compatible change was made by some other user agent).  In the latter case, the origin server MUST NOT send a validator header field in the response unless it can verify that the request is a duplicate of an immediately prior change made by the same user agent. </del> <ins> If-Match condition evaluates to false.  Instead, the origin server MAY indicate that the conditional request failed by responding with a status code.  Alternatively, if the request is a state-changing operation that appears to have already been applied to the selected representation, the origin server MAY respond with a status code (i.e., the change requested by the user agent has already succeeded, but the user agent might not be aware of it, perhaps because the prior response was lost or an equivalent change was made by some other user agent). Allowing an origin server to send a success response when a change request appears to have already been applied is more efficient for many authoring use cases, but comes with some risk if multiple user agents are making change requests that are very similar but not cooperative.  For example, multiple user agents writing to a common resource as a semaphore (e.g., a non-atomic increment) are likely to collide and potentially lose important state transitions.  For those kinds of resources, an origin server is better off being stringent in sending 412 for every failed precondition on an unsafe method.  In other cases, excluding the ETag field from a success response might encourage the user agent to perform a GET as its next request to eliminate confusion about the resource's current state. </ins> The If-Match header field can be ignored by caches and intermediaries because it is not applicable to a stored response.
. A recipient MUST ignore the If-Unmodified-Since header field if the <del> received field value is not a valid HTTP-date, or if the field value has more than one member. </del> <ins> received field value is not a valid HTTP-date (including when the field value appears to be a list of dates). </ins> A recipient MUST interpret an If-Unmodified-Since field value's timestamp in terms of the origin server's clock.
(e.g., POST, PUT, DELETE) to prevent accidental overwrites when multiple user agents might be acting in parallel on a resource that does not supply entity-tags with its representations (i.e., to <del> prevent the "lost update" problem).  It can also be used with safe methods to abort a request if the </del> <ins> prevent the "lost update" problem).  It can also be used with any method to abort a request if the </ins> <del> does not match one already stored (or partially stored) from a prior request. </del> <ins> does not match one that the client already stored (or partially stored) from a prior request. </ins> An origin server that receives an If-Unmodified-Since header field MUST evaluate the condition as per evaluation prior to performing the
If the selected representation has a last modification date, the origin server MUST NOT perform the requested method if that date is more recent than the date provided in the field value.  Instead, the <del> origin server MUST respond with either a) the status code or b) one of the status codes if the origin server has verified that a state change is being requested and the final state is already reflected in the current state of the target resource (i.e., the change requested by the user agent has already succeeded, but the user agent might not be aware of that because the prior response message was lost or a compatible change was made by some other user agent).  In the latter case, the origin server MUST NOT send a validator header field in the response unless it can verify that the request is a duplicate of an immediately prior change made by the same user agent. </del> <ins> origin server MAY indicate that the conditional request failed by responding with a status code.  Alternatively, if the request is a state-changing operation that appears to have already been applied to the selected representation, the origin server MAY respond with a status code (i.e., the change requested by the user agent has already succeeded, but the user agent might not be aware of it, perhaps because the prior response was lost or an equivalent change was made by some other user agent). Allowing an origin server to send a success response when a change request appears to have already been applied is more efficient for many authoring use cases, but comes with some risk if multiple user agents are making change requests that are very similar but not cooperative.  In those cases, an origin server is better off being stringent in sending 412 for every failed precondition on an unsafe method. </ins> The If-Unmodified-Since header field can be ignored by caches and intermediaries because it is not applicable to a stored response.
7.2.4. <ins> The "Content-Length" header field indicates the associated representation's data length as a decimal non-negative integer number of octets.  When transferring a representation in a message, Content- Length refers specifically to the amount of data enclosed so that it can be used to delimit framing of the message body (e.g., body.content-length).  In other cases, Content-Length indicates the selected representation's current length, which can be used by recipients to estimate transfer time or compare to previously stored representations. </ins> An example is A sender MUST NOT send a Content-Length header field in any message
connection (===) between the user agent (UA) and the origin server (O). <del> Each major version of HTTP defines its own syntax for the inclusion of information in messages.  Nevertheless, a common abstraction is that a message includes some form of envelope/framing, a potential set of named fields up front (a header section), a potential body, and a potential following set of named fields (a trailer section). </del> <ins> Each major version of HTTP defines its own syntax for the communication of messages.  Nevertheless, a common abstraction is that each message contains some form of envelope/framing with self- descriptive control data that indicates its semantics and routing, a potential set of named fields up front (a header section), a potential body, and potential fields sent after the body begins (trailer sections). </ins> <del> A client sends an HTTP request to a server in the form of a </del> <ins> A client sends requests to a server in the form of a </ins> message with a method (methods) and request target.  The request might also contain header fields for request modifiers, client
method, and trailer fields for metadata collected while sending the payload. <del> A server responds to a client's request by sending one or more HTTP </del> <ins> A server responds to a client's request by sending one or more </ins> <del> messages, each including a success or error code (status.codes).  The response might also contain header fields for server information, resource metadata, and representation metadata (header.and.trailer.fields), a payload body (payload.body) to be interpreted in accordance with the status code, and trailer fields for metadata collected while sending the payload. </del> <ins> messages, each including a status code (status.codes).  The response might also contain header fields for server information, resource metadata, and representation metadata (header.and.trailer.fields), a payload body (payload.body) to be interpreted in accordance with the status code, and trailer fields for metadata collected while sending the payload. </ins> <del> One of the functions of the message framing mechanism is to assure that messages are </del> <ins> One of the functions of message framing is to assure that messages are </ins> . A message is considered complete when all of the octets indicated by its framing are available.  Note that, when no explicit framing is
5. HTTP messages use key/value pairs to convey data about the message, <del> its payload, the target resource, or the connection (i.e., control data).  They are called "HTTP fields" or just " </del> <ins> its payload, the target resource, or the connection.  They are called "HTTP fields" or just " </ins> ". <del> Every message can have two separate areas that such fields can occur within; the " </del> <ins> Fields that are sent/received before the message body are referred to as "header fields" (or just "headers", colloquially) and are located within the " </ins> <del> " (or just "header section") preceding the message body and containing "header fields" (or just "headers", colloquially) and the " </del> <ins> " of a message.  We refer to some named fields specifically as a "header field" when they are only allowed to be sent in the header section. Fields that are sent/received after the header section has ended (usually after the message body begins to stream) are referred to as "trailer fields" (or just "trailers", colloquially) and located within a " </ins> <del> " (or just "trailer section") after the message body containing "trailer fields" (or just "trailers" colloquially).  Header fields are more common; see trailer.fields for discussion of the applicability and limitations of trailer fields. </del> <ins> ".  One or more trailer sections are only possible when supported by the version of HTTP in use and enabled by an extensible mechanism for framing message sections. </ins> Both sections are composed of any number of "