The Tor Browser: netwerk/protocol/http/nsHttpResponseHead.cpp@6474c204b198 (annotated)

netwerk/protocol/http/nsHttpResponseHead.cpp@6474c204b198 (annotated)

netwerk/protocol/http/nsHttpResponseHead.cpp

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
 /* vim:set ts=4 sw=4 sts=4 et cin: */
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 // HttpLog.h should generally be included first
 #include "HttpLog.h"
 #include "nsHttpResponseHead.h"
 #include "nsPrintfCString.h"
 #include "prtime.h"
 #include "nsURLHelper.h"
 #include <algorithm>
 namespace mozilla {
 namespace net {
 //-----------------------------------------------------------------------------
 // nsHttpResponseHead <public>
 //-----------------------------------------------------------------------------
 nsresult
 nsHttpResponseHead::SetHeader(nsHttpAtom hdr,
                               const nsACString &val,
                               bool merge)
 {
     nsresult rv = mHeaders.SetHeader(hdr, val, merge);
     if (NS_FAILED(rv)) return rv;
     // respond to changes in these headers.  we need to reparse the entire
     // header since the change may have merged in additional values.
     if (hdr == nsHttp::Cache_Control)
         ParseCacheControl(mHeaders.PeekHeader(hdr));
     else if (hdr == nsHttp::Pragma)
         ParsePragma(mHeaders.PeekHeader(hdr));
     return NS_OK;
 }
 void
 nsHttpResponseHead::SetContentLength(int64_t len)
 {
     mContentLength = len;
     if (len < 0)
         mHeaders.ClearHeader(nsHttp::Content_Length);
     else
         mHeaders.SetHeader(nsHttp::Content_Length, nsPrintfCString("%lld", len));
 }
 void
 nsHttpResponseHead::Flatten(nsACString &buf, bool pruneTransients)
 {
     if (mVersion == NS_HTTP_VERSION_0_9)
         return;
     buf.AppendLiteral("HTTP/");
     if (mVersion == NS_HTTP_VERSION_2_0)
         buf.AppendLiteral("2.0 ");
     else if (mVersion == NS_HTTP_VERSION_1_1)
         buf.AppendLiteral("1.1 ");
     else
         buf.AppendLiteral("1.0 ");
     buf.Append(nsPrintfCString("%u", unsigned(mStatus)) +
                NS_LITERAL_CSTRING(" ") +
                mStatusText +
                NS_LITERAL_CSTRING("\r\n"));
     if (!pruneTransients) {
         mHeaders.Flatten(buf, false);
         return;
     }
     // otherwise, we need to iterate over the headers and only flatten
     // those that are appropriate.
     uint32_t i, count = mHeaders.Count();
     for (i=0; i<count; ++i) {
         nsHttpAtom header;
         const char *value = mHeaders.PeekHeaderAt(i, header);
         if (!value || header == nsHttp::Connection
                    || header == nsHttp::Proxy_Connection
                    || header == nsHttp::Keep_Alive
                    || header == nsHttp::WWW_Authenticate
                    || header == nsHttp::Proxy_Authenticate
                    || header == nsHttp::Trailer
                    || header == nsHttp::Transfer_Encoding
                    || header == nsHttp::Upgrade
                    // XXX this will cause problems when we start honoring
                    // Cache-Control: no-cache="set-cookie", what to do?
                    || header == nsHttp::Set_Cookie)
             continue;
         // otherwise, write out the "header: value\r\n" line
         buf.Append(nsDependentCString(header.get()) +
                    NS_LITERAL_CSTRING(": ") +
                    nsDependentCString(value) +
                    NS_LITERAL_CSTRING("\r\n"));
     }
 }
 nsresult
 nsHttpResponseHead::Parse(char *block)
 {
     LOG(("nsHttpResponseHead::Parse [this=%p]\n", this));
     // this command works on a buffer as prepared by Flatten, as such it is
     // not very forgiving ;-)
     char *p = PL_strstr(block, "\r\n");
     if (!p)
         return NS_ERROR_UNEXPECTED;
     *p = 0;
     ParseStatusLine(block);
     do {
         block = p + 2;
 		if (*block == 0)
 			break;
         p = PL_strstr(block, "\r\n");
         if (!p)
             return NS_ERROR_UNEXPECTED;
         *p = 0;
         ParseHeaderLine(block);
     } while (1);
     return NS_OK;
 }
 void
 nsHttpResponseHead::AssignDefaultStatusText()
 {
     LOG(("response status line needs default reason phrase\n"));
     // if a http response doesn't contain a reason phrase, put one in based
     // on the status code. The reason phrase is totally meaningless so its
     // ok to have a default catch all here - but this makes debuggers and addons
     // a little saner to use if we don't map things to "404 OK" or other nonsense.
     // In particular, HTTP/2 does not use reason phrases at all so they need to
     // always be injected.
     switch (mStatus) {
         // start with the most common
     case 200:
         mStatusText.AssignLiteral("OK");
         break;
     case 404:
         mStatusText.AssignLiteral("Not Found");
         break;
     case 301:
         mStatusText.AssignLiteral("Moved Permanently");
         break;
     case 304:
         mStatusText.AssignLiteral("Not Modified");
         break;
     case 307:
         mStatusText.AssignLiteral("Temporary Redirect");
         break;
     case 500:
         mStatusText.AssignLiteral("Internal Server Error");
         break;
         // also well known
     case 100:
         mStatusText.AssignLiteral("Continue");
         break;
     case 101:
         mStatusText.AssignLiteral("Switching Protocols");
         break;
     case 201:
         mStatusText.AssignLiteral("Created");
         break;
     case 202:
         mStatusText.AssignLiteral("Accepted");
         break;
     case 203:
         mStatusText.AssignLiteral("Non Authoritative");
         break;
     case 204:
         mStatusText.AssignLiteral("No Content");
         break;
     case 205:
         mStatusText.AssignLiteral("Reset Content");
         break;
     case 206:
         mStatusText.AssignLiteral("Partial Content");
         break;
     case 300:
         mStatusText.AssignLiteral("Multiple Choices");
         break;
     case 302:
         mStatusText.AssignLiteral("Found");
         break;
     case 303:
         mStatusText.AssignLiteral("See Other");
         break;
     case 305:
         mStatusText.AssignLiteral("Use Proxy");
         break;
     case 308:
         mStatusText.AssignLiteral("Permanent Redirect");
         break;
     case 400:
         mStatusText.AssignLiteral("Bad Request");
         break;
     case 401:
         mStatusText.AssignLiteral("Unauthorized");
         break;
     case 402:
         mStatusText.AssignLiteral("Payment Required");
         break;
     case 403:
         mStatusText.AssignLiteral("Forbidden");
         break;
     case 405:
         mStatusText.AssignLiteral("Method Not Allowed");
         break;
     case 406:
         mStatusText.AssignLiteral("Not Acceptable");
         break;
     case 407:
         mStatusText.AssignLiteral("Proxy Authentication Required");
         break;
     case 408:
         mStatusText.AssignLiteral("Request Timeout");
         break;
     case 409:
         mStatusText.AssignLiteral("Conflict");
         break;
     case 410:
         mStatusText.AssignLiteral("Gone");
         break;
     case 411:
         mStatusText.AssignLiteral("Length Required");
         break;
     case 412:
         mStatusText.AssignLiteral("Precondition Failed");
         break;
     case 413:
         mStatusText.AssignLiteral("Request Entity Too Large");
         break;
     case 414:
         mStatusText.AssignLiteral("Request URI Too Long");
         break;
     case 415:
         mStatusText.AssignLiteral("Unsupported Media Type");
         break;
     case 416:
         mStatusText.AssignLiteral("Requested Range Not Satisfiable");
         break;
     case 417:
         mStatusText.AssignLiteral("Expectation Failed");
         break;
     case 501:
         mStatusText.AssignLiteral("Not Implemented");
         break;
     case 502:
         mStatusText.AssignLiteral("Bad Gateway");
         break;
     case 503:
         mStatusText.AssignLiteral("Service Unavailable");
         break;
     case 504:
         mStatusText.AssignLiteral("Gateway Timeout");
         break;
     case 505:
         mStatusText.AssignLiteral("HTTP Version Unsupported");
         break;
     default:
         mStatusText.AssignLiteral("No Reason Phrase");
         break;
     }
 }
 void
 nsHttpResponseHead::ParseStatusLine(const char *line)
 {
     //
     // Parse Status-Line:: HTTP-Version SP Status-Code SP Reason-Phrase CRLF
     //
     // HTTP-Version
     ParseVersion(line);
     if ((mVersion == NS_HTTP_VERSION_0_9) || !(line = PL_strchr(line, ' '))) {
         mStatus = 200;
         AssignDefaultStatusText();
     }
     else {
         // Status-Code
         mStatus = (uint16_t) atoi(++line);
         if (mStatus == 0) {
             LOG(("mal-formed response status; assuming status = 200\n"));
             mStatus = 200;
         }
         // Reason-Phrase is whatever is remaining of the line
         if (!(line = PL_strchr(line, ' '))) {
             AssignDefaultStatusText();
         }
         else
             mStatusText = nsDependentCString(++line);
     }
     LOG(("Have status line [version=%u status=%u statusText=%s]\n",
         unsigned(mVersion), unsigned(mStatus), mStatusText.get()));
 }
 nsresult
 nsHttpResponseHead::ParseHeaderLine(const char *line)
 {
     nsHttpAtom hdr = {0};
     char *val;
     nsresult rv;
     rv = mHeaders.ParseHeaderLine(line, &hdr, &val);
     if (NS_FAILED(rv))
         return rv;
     // leading and trailing LWS has been removed from |val|
     // handle some special case headers...
     if (hdr == nsHttp::Content_Length) {
         int64_t len;
         const char *ignored;
         // permit only a single value here.
         if (nsHttp::ParseInt64(val, &ignored, &len)) {
             mContentLength = len;
         }
         else {
             // If this is a negative content length then just ignore it
             LOG(("invalid content-length! %s\n", val));
         }
     }
     else if (hdr == nsHttp::Content_Type) {
         LOG(("ParseContentType [type=%s]\n", val));
         bool dummy;
         net_ParseContentType(nsDependentCString(val),
                              mContentType, mContentCharset, &dummy);
     }
     else if (hdr == nsHttp::Cache_Control)
         ParseCacheControl(val);
     else if (hdr == nsHttp::Pragma)
         ParsePragma(val);
     return NS_OK;
 }
 // From section 13.2.3 of RFC2616, we compute the current age of a cached
 // response as follows:
 //
 //    currentAge = max(max(0, responseTime - dateValue), ageValue)
 //               + now - requestTime
 //
 //    where responseTime == now
 //
 // This is typically a very small number.
 //
 nsresult
 nsHttpResponseHead::ComputeCurrentAge(uint32_t now,
                                       uint32_t requestTime,
                                       uint32_t *result) const
 {
     uint32_t dateValue;
     uint32_t ageValue;
     *result = 0;
     if (NS_FAILED(GetDateValue(&dateValue))) {
         LOG(("nsHttpResponseHead::ComputeCurrentAge [this=%p] "
              "Date response header not set!\n", this));
         // Assume we have a fast connection and that our clock
         // is in sync with the server.
         dateValue = now;
     }
     // Compute apparent age
     if (now > dateValue)
         *result = now - dateValue;
     // Compute corrected received age
     if (NS_SUCCEEDED(GetAgeValue(&ageValue)))
         *result = std::max(*result, ageValue);
     MOZ_ASSERT(now >= requestTime, "bogus request time");
     // Compute current age
     *result += (now - requestTime);
     return NS_OK;
 }
 // From section 13.2.4 of RFC2616, we compute the freshness lifetime of a cached
 // response as follows:
 //
 //     freshnessLifetime = max_age_value
 // <or>
 //     freshnessLifetime = expires_value - date_value
 // <or>
 //     freshnessLifetime = (date_value - last_modified_value) * 0.10
 // <or>
 //     freshnessLifetime = 0
 //
 nsresult
 nsHttpResponseHead::ComputeFreshnessLifetime(uint32_t *result) const
 {
     *result = 0;
     // Try HTTP/1.1 style max-age directive...
     if (NS_SUCCEEDED(GetMaxAgeValue(result)))
         return NS_OK;
     *result = 0;
     uint32_t date = 0, date2 = 0;
     if (NS_FAILED(GetDateValue(&date)))
         date = NowInSeconds(); // synthesize a date header if none exists
     // Try HTTP/1.0 style expires header...
     if (NS_SUCCEEDED(GetExpiresValue(&date2))) {
         if (date2 > date)
             *result = date2 - date;
         // the Expires header can specify a date in the past.
         return NS_OK;
     }
     // Fallback on heuristic using last modified header...
     if (NS_SUCCEEDED(GetLastModifiedValue(&date2))) {
         LOG(("using last-modified to determine freshness-lifetime\n"));
         LOG(("last-modified = %u, date = %u\n", date2, date));
         if (date2 <= date) {
             // this only makes sense if last-modified is actually in the past
             *result = (date - date2) / 10;
             return NS_OK;
         }
     }
     // These responses can be cached indefinitely.
     if ((mStatus == 300) || nsHttp::IsPermanentRedirect(mStatus)) {
         *result = uint32_t(-1);
         return NS_OK;
     }
     LOG(("nsHttpResponseHead::ComputeFreshnessLifetime [this = %x] "
          "Insufficient information to compute a non-zero freshness "
          "lifetime!\n", this));
     return NS_OK;
 }
 bool
 nsHttpResponseHead::MustValidate() const
 {
     LOG(("nsHttpResponseHead::MustValidate ??\n"));
     // Some response codes are cacheable, but the rest are not.  This switch
     // should stay in sync with the list in nsHttpChannel::ProcessResponse
     switch (mStatus) {
         // Success codes
     case 200:
     case 203:
     case 206:
         // Cacheable redirects
     case 300:
     case 301:
     case 302:
     case 304:
     case 307:
     case 308:
         break;
         // Uncacheable redirects
     case 303:
     case 305:
         // Other known errors
     case 401:
     case 407:
     case 412:
     case 416:
     default:  // revalidate unknown error pages
         LOG(("Must validate since response is an uncacheable error page\n"));
         return true;
     }
     // The no-cache response header indicates that we must validate this
     // cached response before reusing.
     if (NoCache()) {
         LOG(("Must validate since response contains 'no-cache' header\n"));
         return true;
     }
     // Likewise, if the response is no-store, then we must validate this
     // cached response before reusing.  NOTE: it may seem odd that a no-store
     // response may be cached, but indeed all responses are cached in order
     // to support File->SaveAs, View->PageSource, and other browser features.
     if (NoStore()) {
         LOG(("Must validate since response contains 'no-store' header\n"));
         return true;
     }
     // Compare the Expires header to the Date header.  If the server sent an
     // Expires header with a timestamp in the past, then we must validate this
     // cached response before reusing.
     if (ExpiresInPast()) {
         LOG(("Must validate since Expires < Date\n"));
         return true;
     }
     LOG(("no mandatory validation requirement\n"));
     return false;
 }
 bool
 nsHttpResponseHead::MustValidateIfExpired() const
 {
     // according to RFC2616, section 14.9.4:
     //
     //  When the must-revalidate directive is present in a response received by a
     //  cache, that cache MUST NOT use the entry after it becomes stale to respond to
     //  a subsequent request without first revalidating it with the origin server.
     //
     return HasHeaderValue(nsHttp::Cache_Control, "must-revalidate");
 }
 bool
 nsHttpResponseHead::IsResumable() const
 {
     // even though some HTTP/1.0 servers may support byte range requests, we're not
     // going to bother with them, since those servers wouldn't understand If-Range.
     // Also, while in theory it may be possible to resume when the status code
     // is not 200, it is unlikely to be worth the trouble, especially for
     // non-2xx responses.
     return mStatus == 200 &&
            mVersion >= NS_HTTP_VERSION_1_1 &&
            PeekHeader(nsHttp::Content_Length) &&
           (PeekHeader(nsHttp::ETag) || PeekHeader(nsHttp::Last_Modified)) &&
            HasHeaderValue(nsHttp::Accept_Ranges, "bytes");
 }
 bool
 nsHttpResponseHead::ExpiresInPast() const
 {
     uint32_t maxAgeVal, expiresVal, dateVal;
     // Bug #203271. Ensure max-age directive takes precedence over Expires
     if (NS_SUCCEEDED(GetMaxAgeValue(&maxAgeVal))) {
         return false;
     }
     return NS_SUCCEEDED(GetExpiresValue(&expiresVal)) &&
            NS_SUCCEEDED(GetDateValue(&dateVal)) &&
            expiresVal < dateVal;
 }
 nsresult
 nsHttpResponseHead::UpdateHeaders(const nsHttpHeaderArray &headers)
 {
     LOG(("nsHttpResponseHead::UpdateHeaders [this=%p]\n", this));
     uint32_t i, count = headers.Count();
     for (i=0; i<count; ++i) {
         nsHttpAtom header;
         const char *val = headers.PeekHeaderAt(i, header);
         if (!val) {
             continue;
         }
         // Ignore any hop-by-hop headers...
         if (header == nsHttp::Connection          ||
             header == nsHttp::Proxy_Connection    ||
             header == nsHttp::Keep_Alive          ||
             header == nsHttp::Proxy_Authenticate  ||
             header == nsHttp::Proxy_Authorization || // not a response header!
             header == nsHttp::TE                  ||
             header == nsHttp::Trailer             ||
             header == nsHttp::Transfer_Encoding   ||
             header == nsHttp::Upgrade             ||
         // Ignore any non-modifiable headers...
             header == nsHttp::Content_Location    ||
             header == nsHttp::Content_MD5         ||
             header == nsHttp::ETag                ||
         // Assume Cache-Control: "no-transform"
             header == nsHttp::Content_Encoding    ||
             header == nsHttp::Content_Range       ||
             header == nsHttp::Content_Type        ||
         // Ignore wacky headers too...
             // this one is for MS servers that send "Content-Length: 0"
             // on 304 responses
             header == nsHttp::Content_Length) {
             LOG(("ignoring response header [%s: %s]\n", header.get(), val));
         }
         else {
             LOG(("new response header [%s: %s]\n", header.get(), val));
             // overwrite the current header value with the new value...
             SetHeader(header, nsDependentCString(val));
         }
     }
     return NS_OK;
 }
 void
 nsHttpResponseHead::Reset()
 {
     LOG(("nsHttpResponseHead::Reset\n"));
     ClearHeaders();
     mVersion = NS_HTTP_VERSION_1_1;
     mStatus = 200;
     mContentLength = UINT64_MAX;
     mCacheControlNoStore = false;
     mCacheControlNoCache = false;
     mPragmaNoCache = false;
     mStatusText.Truncate();
     mContentType.Truncate();
     mContentCharset.Truncate();
 }
 nsresult
 nsHttpResponseHead::ParseDateHeader(nsHttpAtom header, uint32_t *result) const
 {
     const char *val = PeekHeader(header);
     if (!val)
         return NS_ERROR_NOT_AVAILABLE;
     PRTime time;
     PRStatus st = PR_ParseTimeString(val, true, &time);
     if (st != PR_SUCCESS)
         return NS_ERROR_NOT_AVAILABLE;
     *result = PRTimeToSeconds(time);
     return NS_OK;
 }
 nsresult
 nsHttpResponseHead::GetAgeValue(uint32_t *result) const
 {
     const char *val = PeekHeader(nsHttp::Age);
     if (!val)
         return NS_ERROR_NOT_AVAILABLE;
     *result = (uint32_t) atoi(val);
     return NS_OK;
 }
 // Return the value of the (HTTP 1.1) max-age directive, which itself is a
 // component of the Cache-Control response header
 nsresult
 nsHttpResponseHead::GetMaxAgeValue(uint32_t *result) const
 {
     const char *val = PeekHeader(nsHttp::Cache_Control);
     if (!val)
         return NS_ERROR_NOT_AVAILABLE;
     const char *p = nsHttp::FindToken(val, "max-age", HTTP_HEADER_VALUE_SEPS "=");
     if (!p)
         return NS_ERROR_NOT_AVAILABLE;
     p += 7;
     while (*p == ' ' || *p == '\t')
         ++p;
     if (*p != '=')
         return NS_ERROR_NOT_AVAILABLE;
     ++p;
     while (*p == ' ' || *p == '\t')
         ++p;
     int maxAgeValue = atoi(p);
     if (maxAgeValue < 0)
         maxAgeValue = 0;
     *result = static_cast<uint32_t>(maxAgeValue);
     return NS_OK;
 }
 nsresult
 nsHttpResponseHead::GetExpiresValue(uint32_t *result) const
 {
     const char *val = PeekHeader(nsHttp::Expires);
     if (!val)
         return NS_ERROR_NOT_AVAILABLE;
     PRTime time;
     PRStatus st = PR_ParseTimeString(val, true, &time);
     if (st != PR_SUCCESS) {
         // parsing failed... RFC 2616 section 14.21 says we should treat this
         // as an expiration time in the past.
         *result = 0;
         return NS_OK;
     }
     if (time < 0)
         *result = 0;
     else
         *result = PRTimeToSeconds(time);
     return NS_OK;
 }
 int64_t
 nsHttpResponseHead::TotalEntitySize() const
 {
     const char* contentRange = PeekHeader(nsHttp::Content_Range);
     if (!contentRange)
         return ContentLength();
     // Total length is after a slash
     const char* slash = strrchr(contentRange, '/');
     if (!slash)
         return -1; // No idea what the length is
     slash++;
     if (*slash == '*') // Server doesn't know the length
         return -1;
     int64_t size;
     if (!nsHttp::ParseInt64(slash, &size))
         size = UINT64_MAX;
     return size;
 }
 //-----------------------------------------------------------------------------
 // nsHttpResponseHead <private>
 //-----------------------------------------------------------------------------
 void
 nsHttpResponseHead::ParseVersion(const char *str)
 {
     // Parse HTTP-Version:: "HTTP" "/" 1*DIGIT "." 1*DIGIT
     LOG(("nsHttpResponseHead::ParseVersion [version=%s]\n", str));
     // make sure we have HTTP at the beginning
     if (PL_strncasecmp(str, "HTTP", 4) != 0) {
         if (PL_strncasecmp(str, "ICY ", 4) == 0) {
             // ShoutCast ICY is HTTP/1.0-like. Assume it is HTTP/1.0.
             LOG(("Treating ICY as HTTP 1.0\n"));
             mVersion = NS_HTTP_VERSION_1_0;
             return;
         }
         LOG(("looks like a HTTP/0.9 response\n"));
         mVersion = NS_HTTP_VERSION_0_9;
         return;
     }
     str += 4;
     if (*str != '/') {
         LOG(("server did not send a version number; assuming HTTP/1.0\n"));
         // NCSA/1.5.2 has a bug in which it fails to send a version number
         // if the request version is HTTP/1.1, so we fall back on HTTP/1.0
         mVersion = NS_HTTP_VERSION_1_0;
         return;
     }
     char *p = PL_strchr(str, '.');
     if (p == nullptr) {
         LOG(("mal-formed server version; assuming HTTP/1.0\n"));
         mVersion = NS_HTTP_VERSION_1_0;
         return;
     }
     ++p; // let b point to the minor version
     int major = atoi(str + 1);
     int minor = atoi(p);
     if ((major > 2) || ((major == 2) && (minor >= 0)))
         mVersion = NS_HTTP_VERSION_2_0;
     else if ((major == 1) && (minor >= 1))
         // at least HTTP/1.1
         mVersion = NS_HTTP_VERSION_1_1;
     else
         // treat anything else as version 1.0
         mVersion = NS_HTTP_VERSION_1_0;
 }
 void
 nsHttpResponseHead::ParseCacheControl(const char *val)
 {
     if (!(val && *val)) {
         // clear flags
         mCacheControlNoCache = false;
         mCacheControlNoStore = false;
         return;
     }
     // search header value for occurrence(s) of "no-cache" but ignore
     // occurrence(s) of "no-cache=blah"
     if (nsHttp::FindToken(val, "no-cache", HTTP_HEADER_VALUE_SEPS))
         mCacheControlNoCache = true;
     // search header value for occurrence of "no-store"
     if (nsHttp::FindToken(val, "no-store", HTTP_HEADER_VALUE_SEPS))
         mCacheControlNoStore = true;
 }
 void
 nsHttpResponseHead::ParsePragma(const char *val)
 {
     LOG(("nsHttpResponseHead::ParsePragma [val=%s]\n", val));
     if (!(val && *val)) {
         // clear no-cache flag
         mPragmaNoCache = false;
         return;
     }
     // Although 'Pragma: no-cache' is not a standard HTTP response header (it's
     // a request header), caching is inhibited when this header is present so
     // as to match existing Navigator behavior.
     if (nsHttp::FindToken(val, "no-cache", HTTP_HEADER_VALUE_SEPS))
         mPragmaNoCache = true;
 }
 } // namespace mozilla::net
 } // namespace mozilla

The Tor Browser / annotate

netwerk/protocol/http/nsHttpResponseHead.cpp@6474c204b198 (annotated)

netwerk/protocol/http/nsHttpResponseHead.cpp