pages-server/server/upstream/upstream.go

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Go
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package upstream
import (
"errors"
"fmt"
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"io"
"net/http"
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"strings"
"time"
"github.com/rs/zerolog/log"
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"codeberg.org/codeberg/pages/html"
"codeberg.org/codeberg/pages/server/cache"
"codeberg.org/codeberg/pages/server/context"
"codeberg.org/codeberg/pages/server/gitea"
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)
const (
headerLastModified = "Last-Modified"
headerIfModifiedSince = "If-Modified-Since"
rawMime = "text/plain; charset=utf-8"
)
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// upstreamIndexPages lists pages that may be considered as index pages for directories.
var upstreamIndexPages = []string{
"index.html",
}
// upstreamNotFoundPages lists pages that may be considered as custom 404 Not Found pages.
var upstreamNotFoundPages = []string{
"404.html",
}
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// Options provides various options for the upstream request.
type Options struct {
TargetOwner string
TargetRepo string
TargetBranch string
TargetPath string
// Used for debugging purposes.
Host string
TryIndexPages bool
BranchTimestamp time.Time
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// internal
appendTrailingSlash bool
redirectIfExists string
ServeRaw bool
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}
// Upstream requests a file from the Gitea API at GiteaRoot and writes it to the request context.
func (o *Options) Upstream(ctx *context.Context, giteaClient *gitea.Client, redirectsCache cache.ICache) bool {
log := log.With().Strs("upstream", []string{o.TargetOwner, o.TargetRepo, o.TargetBranch, o.TargetPath}).Logger()
FIX blank internal pages (#164) (#292) Hello 👋 since it affected my deployment of the pages server I started to look into the problem of the blank pages and think I found a solution for it: 1. There is no check if the file response is empty, neither in cache retrieval nor in writing of a cache. Also the provided method for checking for empty responses had a bug. 2. I identified the redirect response to be the issue here. There is a cache write with the full cache key (e. g. rawContent/user/repo|branch|route/index.html) happening in the handling of the redirect response. But the written body here is empty. In the triggered request from the redirect response the server then finds a cache item to the key and serves the empty body. A quick fix is the check for empty file responses mentioned in 1. 3. The decision to redirect the user comes quite far down in the upstream function. Before that happens a lot of stuff that may not be important since after the redirect response comes a new request anyway. Also, I suspect that this causes the caching problem because there is a request to the forge server and its error handling with some recursions happening before. I propose to move two of the redirects before "Preparing" 4. The recursion in the upstream function makes it difficult to understand what is actually happening. I added some more logging to have an easier time with that. 5. I changed the default behaviour to append a trailing slash to the path to true. In my tested scenarios it happened anyway. This way there is no recursion happening before the redirect. I am not developing in go frequently and rarely contribute to open source -> so feedback of all kind is appreciated closes #164 Reviewed-on: https://codeberg.org/Codeberg/pages-server/pulls/292 Reviewed-by: 6543 <6543@obermui.de> Reviewed-by: crapStone <codeberg@crapstone.dev> Co-authored-by: Hoernschen <julian.hoernschemeyer@mailbox.org> Co-committed-by: Hoernschen <julian.hoernschemeyer@mailbox.org>
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log.Debug().Msg("Start")
if o.TargetOwner == "" || o.TargetRepo == "" {
html.ReturnErrorPage(ctx, "forge client: either repo owner or name info is missing", http.StatusBadRequest)
return true
}
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// Check if the branch exists and when it was modified
if o.BranchTimestamp.IsZero() {
branchExist, err := o.GetBranchTimestamp(giteaClient)
// handle 404
if err != nil && errors.Is(err, gitea.ErrorNotFound) || !branchExist {
html.ReturnErrorPage(ctx,
fmt.Sprintf("branch <code>%q</code> for <code>%s/%s</code> not found", o.TargetBranch, o.TargetOwner, o.TargetRepo),
http.StatusNotFound)
return true
}
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// handle unexpected errors
if err != nil {
html.ReturnErrorPage(ctx,
fmt.Sprintf("could not get timestamp of branch <code>%q</code>: '%v'", o.TargetBranch, err),
http.StatusFailedDependency)
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return true
}
}
// Check if the browser has a cached version
if ctx.Response() != nil {
if ifModifiedSince, err := time.Parse(time.RFC1123, ctx.Response().Header.Get(headerIfModifiedSince)); err == nil {
if ifModifiedSince.After(o.BranchTimestamp) {
ctx.RespWriter.WriteHeader(http.StatusNotModified)
log.Trace().Msg("check response against last modified: valid")
return true
}
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}
log.Trace().Msg("check response against last modified: outdated")
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}
log.Debug().Msg("Preparing")
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reader, header, statusCode, err := giteaClient.ServeRawContent(o.TargetOwner, o.TargetRepo, o.TargetBranch, o.TargetPath)
if reader != nil {
defer reader.Close()
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}
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log.Debug().Msg("Aquisting")
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// Handle not found error
if err != nil && errors.Is(err, gitea.ErrorNotFound) {
FIX blank internal pages (#164) (#292) Hello 👋 since it affected my deployment of the pages server I started to look into the problem of the blank pages and think I found a solution for it: 1. There is no check if the file response is empty, neither in cache retrieval nor in writing of a cache. Also the provided method for checking for empty responses had a bug. 2. I identified the redirect response to be the issue here. There is a cache write with the full cache key (e. g. rawContent/user/repo|branch|route/index.html) happening in the handling of the redirect response. But the written body here is empty. In the triggered request from the redirect response the server then finds a cache item to the key and serves the empty body. A quick fix is the check for empty file responses mentioned in 1. 3. The decision to redirect the user comes quite far down in the upstream function. Before that happens a lot of stuff that may not be important since after the redirect response comes a new request anyway. Also, I suspect that this causes the caching problem because there is a request to the forge server and its error handling with some recursions happening before. I propose to move two of the redirects before "Preparing" 4. The recursion in the upstream function makes it difficult to understand what is actually happening. I added some more logging to have an easier time with that. 5. I changed the default behaviour to append a trailing slash to the path to true. In my tested scenarios it happened anyway. This way there is no recursion happening before the redirect. I am not developing in go frequently and rarely contribute to open source -> so feedback of all kind is appreciated closes #164 Reviewed-on: https://codeberg.org/Codeberg/pages-server/pulls/292 Reviewed-by: 6543 <6543@obermui.de> Reviewed-by: crapStone <codeberg@crapstone.dev> Co-authored-by: Hoernschen <julian.hoernschemeyer@mailbox.org> Co-committed-by: Hoernschen <julian.hoernschemeyer@mailbox.org>
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log.Debug().Msg("Handling not found error")
// Get and match redirects
redirects := o.getRedirects(giteaClient, redirectsCache)
if o.matchRedirects(ctx, giteaClient, redirects, redirectsCache) {
FIX blank internal pages (#164) (#292) Hello 👋 since it affected my deployment of the pages server I started to look into the problem of the blank pages and think I found a solution for it: 1. There is no check if the file response is empty, neither in cache retrieval nor in writing of a cache. Also the provided method for checking for empty responses had a bug. 2. I identified the redirect response to be the issue here. There is a cache write with the full cache key (e. g. rawContent/user/repo|branch|route/index.html) happening in the handling of the redirect response. But the written body here is empty. In the triggered request from the redirect response the server then finds a cache item to the key and serves the empty body. A quick fix is the check for empty file responses mentioned in 1. 3. The decision to redirect the user comes quite far down in the upstream function. Before that happens a lot of stuff that may not be important since after the redirect response comes a new request anyway. Also, I suspect that this causes the caching problem because there is a request to the forge server and its error handling with some recursions happening before. I propose to move two of the redirects before "Preparing" 4. The recursion in the upstream function makes it difficult to understand what is actually happening. I added some more logging to have an easier time with that. 5. I changed the default behaviour to append a trailing slash to the path to true. In my tested scenarios it happened anyway. This way there is no recursion happening before the redirect. I am not developing in go frequently and rarely contribute to open source -> so feedback of all kind is appreciated closes #164 Reviewed-on: https://codeberg.org/Codeberg/pages-server/pulls/292 Reviewed-by: 6543 <6543@obermui.de> Reviewed-by: crapStone <codeberg@crapstone.dev> Co-authored-by: Hoernschen <julian.hoernschemeyer@mailbox.org> Co-committed-by: Hoernschen <julian.hoernschemeyer@mailbox.org>
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log.Trace().Msg("redirect")
return true
}
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if o.TryIndexPages {
FIX blank internal pages (#164) (#292) Hello 👋 since it affected my deployment of the pages server I started to look into the problem of the blank pages and think I found a solution for it: 1. There is no check if the file response is empty, neither in cache retrieval nor in writing of a cache. Also the provided method for checking for empty responses had a bug. 2. I identified the redirect response to be the issue here. There is a cache write with the full cache key (e. g. rawContent/user/repo|branch|route/index.html) happening in the handling of the redirect response. But the written body here is empty. In the triggered request from the redirect response the server then finds a cache item to the key and serves the empty body. A quick fix is the check for empty file responses mentioned in 1. 3. The decision to redirect the user comes quite far down in the upstream function. Before that happens a lot of stuff that may not be important since after the redirect response comes a new request anyway. Also, I suspect that this causes the caching problem because there is a request to the forge server and its error handling with some recursions happening before. I propose to move two of the redirects before "Preparing" 4. The recursion in the upstream function makes it difficult to understand what is actually happening. I added some more logging to have an easier time with that. 5. I changed the default behaviour to append a trailing slash to the path to true. In my tested scenarios it happened anyway. This way there is no recursion happening before the redirect. I am not developing in go frequently and rarely contribute to open source -> so feedback of all kind is appreciated closes #164 Reviewed-on: https://codeberg.org/Codeberg/pages-server/pulls/292 Reviewed-by: 6543 <6543@obermui.de> Reviewed-by: crapStone <codeberg@crapstone.dev> Co-authored-by: Hoernschen <julian.hoernschemeyer@mailbox.org> Co-committed-by: Hoernschen <julian.hoernschemeyer@mailbox.org>
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log.Trace().Msg("try index page")
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// copy the o struct & try if an index page exists
optionsForIndexPages := *o
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optionsForIndexPages.TryIndexPages = false
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optionsForIndexPages.appendTrailingSlash = true
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for _, indexPage := range upstreamIndexPages {
optionsForIndexPages.TargetPath = strings.TrimSuffix(o.TargetPath, "/") + "/" + indexPage
if optionsForIndexPages.Upstream(ctx, giteaClient, redirectsCache) {
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return true
}
}
FIX blank internal pages (#164) (#292) Hello 👋 since it affected my deployment of the pages server I started to look into the problem of the blank pages and think I found a solution for it: 1. There is no check if the file response is empty, neither in cache retrieval nor in writing of a cache. Also the provided method for checking for empty responses had a bug. 2. I identified the redirect response to be the issue here. There is a cache write with the full cache key (e. g. rawContent/user/repo|branch|route/index.html) happening in the handling of the redirect response. But the written body here is empty. In the triggered request from the redirect response the server then finds a cache item to the key and serves the empty body. A quick fix is the check for empty file responses mentioned in 1. 3. The decision to redirect the user comes quite far down in the upstream function. Before that happens a lot of stuff that may not be important since after the redirect response comes a new request anyway. Also, I suspect that this causes the caching problem because there is a request to the forge server and its error handling with some recursions happening before. I propose to move two of the redirects before "Preparing" 4. The recursion in the upstream function makes it difficult to understand what is actually happening. I added some more logging to have an easier time with that. 5. I changed the default behaviour to append a trailing slash to the path to true. In my tested scenarios it happened anyway. This way there is no recursion happening before the redirect. I am not developing in go frequently and rarely contribute to open source -> so feedback of all kind is appreciated closes #164 Reviewed-on: https://codeberg.org/Codeberg/pages-server/pulls/292 Reviewed-by: 6543 <6543@obermui.de> Reviewed-by: crapStone <codeberg@crapstone.dev> Co-authored-by: Hoernschen <julian.hoernschemeyer@mailbox.org> Co-committed-by: Hoernschen <julian.hoernschemeyer@mailbox.org>
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log.Trace().Msg("try html file with path name")
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// compatibility fix for GitHub Pages (/example → /example.html)
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optionsForIndexPages.appendTrailingSlash = false
optionsForIndexPages.redirectIfExists = strings.TrimSuffix(ctx.Path(), "/") + ".html"
optionsForIndexPages.TargetPath = o.TargetPath + ".html"
if optionsForIndexPages.Upstream(ctx, giteaClient, redirectsCache) {
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return true
}
}
FIX blank internal pages (#164) (#292) Hello 👋 since it affected my deployment of the pages server I started to look into the problem of the blank pages and think I found a solution for it: 1. There is no check if the file response is empty, neither in cache retrieval nor in writing of a cache. Also the provided method for checking for empty responses had a bug. 2. I identified the redirect response to be the issue here. There is a cache write with the full cache key (e. g. rawContent/user/repo|branch|route/index.html) happening in the handling of the redirect response. But the written body here is empty. In the triggered request from the redirect response the server then finds a cache item to the key and serves the empty body. A quick fix is the check for empty file responses mentioned in 1. 3. The decision to redirect the user comes quite far down in the upstream function. Before that happens a lot of stuff that may not be important since after the redirect response comes a new request anyway. Also, I suspect that this causes the caching problem because there is a request to the forge server and its error handling with some recursions happening before. I propose to move two of the redirects before "Preparing" 4. The recursion in the upstream function makes it difficult to understand what is actually happening. I added some more logging to have an easier time with that. 5. I changed the default behaviour to append a trailing slash to the path to true. In my tested scenarios it happened anyway. This way there is no recursion happening before the redirect. I am not developing in go frequently and rarely contribute to open source -> so feedback of all kind is appreciated closes #164 Reviewed-on: https://codeberg.org/Codeberg/pages-server/pulls/292 Reviewed-by: 6543 <6543@obermui.de> Reviewed-by: crapStone <codeberg@crapstone.dev> Co-authored-by: Hoernschen <julian.hoernschemeyer@mailbox.org> Co-committed-by: Hoernschen <julian.hoernschemeyer@mailbox.org>
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log.Trace().Msg("not found")
ctx.StatusCode = http.StatusNotFound
if o.TryIndexPages {
FIX blank internal pages (#164) (#292) Hello 👋 since it affected my deployment of the pages server I started to look into the problem of the blank pages and think I found a solution for it: 1. There is no check if the file response is empty, neither in cache retrieval nor in writing of a cache. Also the provided method for checking for empty responses had a bug. 2. I identified the redirect response to be the issue here. There is a cache write with the full cache key (e. g. rawContent/user/repo|branch|route/index.html) happening in the handling of the redirect response. But the written body here is empty. In the triggered request from the redirect response the server then finds a cache item to the key and serves the empty body. A quick fix is the check for empty file responses mentioned in 1. 3. The decision to redirect the user comes quite far down in the upstream function. Before that happens a lot of stuff that may not be important since after the redirect response comes a new request anyway. Also, I suspect that this causes the caching problem because there is a request to the forge server and its error handling with some recursions happening before. I propose to move two of the redirects before "Preparing" 4. The recursion in the upstream function makes it difficult to understand what is actually happening. I added some more logging to have an easier time with that. 5. I changed the default behaviour to append a trailing slash to the path to true. In my tested scenarios it happened anyway. This way there is no recursion happening before the redirect. I am not developing in go frequently and rarely contribute to open source -> so feedback of all kind is appreciated closes #164 Reviewed-on: https://codeberg.org/Codeberg/pages-server/pulls/292 Reviewed-by: 6543 <6543@obermui.de> Reviewed-by: crapStone <codeberg@crapstone.dev> Co-authored-by: Hoernschen <julian.hoernschemeyer@mailbox.org> Co-committed-by: Hoernschen <julian.hoernschemeyer@mailbox.org>
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log.Trace().Msg("try not found page")
// copy the o struct & try if a not found page exists
optionsForNotFoundPages := *o
optionsForNotFoundPages.TryIndexPages = false
optionsForNotFoundPages.appendTrailingSlash = false
for _, notFoundPage := range upstreamNotFoundPages {
optionsForNotFoundPages.TargetPath = "/" + notFoundPage
if optionsForNotFoundPages.Upstream(ctx, giteaClient, redirectsCache) {
return true
}
}
FIX blank internal pages (#164) (#292) Hello 👋 since it affected my deployment of the pages server I started to look into the problem of the blank pages and think I found a solution for it: 1. There is no check if the file response is empty, neither in cache retrieval nor in writing of a cache. Also the provided method for checking for empty responses had a bug. 2. I identified the redirect response to be the issue here. There is a cache write with the full cache key (e. g. rawContent/user/repo|branch|route/index.html) happening in the handling of the redirect response. But the written body here is empty. In the triggered request from the redirect response the server then finds a cache item to the key and serves the empty body. A quick fix is the check for empty file responses mentioned in 1. 3. The decision to redirect the user comes quite far down in the upstream function. Before that happens a lot of stuff that may not be important since after the redirect response comes a new request anyway. Also, I suspect that this causes the caching problem because there is a request to the forge server and its error handling with some recursions happening before. I propose to move two of the redirects before "Preparing" 4. The recursion in the upstream function makes it difficult to understand what is actually happening. I added some more logging to have an easier time with that. 5. I changed the default behaviour to append a trailing slash to the path to true. In my tested scenarios it happened anyway. This way there is no recursion happening before the redirect. I am not developing in go frequently and rarely contribute to open source -> so feedback of all kind is appreciated closes #164 Reviewed-on: https://codeberg.org/Codeberg/pages-server/pulls/292 Reviewed-by: 6543 <6543@obermui.de> Reviewed-by: crapStone <codeberg@crapstone.dev> Co-authored-by: Hoernschen <julian.hoernschemeyer@mailbox.org> Co-committed-by: Hoernschen <julian.hoernschemeyer@mailbox.org>
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log.Trace().Msg("not found page missing")
}
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return false
}
// handle unexpected client errors
if err != nil || reader == nil || statusCode != http.StatusOK {
log.Debug().Msg("Handling error")
var msg string
if err != nil {
msg = "forge client: returned unexpected error"
log.Error().Err(err).Msg(msg)
msg = fmt.Sprintf("%s: '%v'", msg, err)
}
if reader == nil {
msg = "forge client: returned no reader"
log.Error().Msg(msg)
}
if statusCode != http.StatusOK {
msg = fmt.Sprintf("forge client: couldn't fetch contents: <code>%d - %s</code>", statusCode, http.StatusText(statusCode))
log.Error().Msg(msg)
}
html.ReturnErrorPage(ctx, msg, http.StatusInternalServerError)
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return true
}
// Append trailing slash if missing (for index files), and redirect to fix filenames in general
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// o.appendTrailingSlash is only true when looking for index pages
if o.appendTrailingSlash && !strings.HasSuffix(ctx.Path(), "/") {
FIX blank internal pages (#164) (#292) Hello 👋 since it affected my deployment of the pages server I started to look into the problem of the blank pages and think I found a solution for it: 1. There is no check if the file response is empty, neither in cache retrieval nor in writing of a cache. Also the provided method for checking for empty responses had a bug. 2. I identified the redirect response to be the issue here. There is a cache write with the full cache key (e. g. rawContent/user/repo|branch|route/index.html) happening in the handling of the redirect response. But the written body here is empty. In the triggered request from the redirect response the server then finds a cache item to the key and serves the empty body. A quick fix is the check for empty file responses mentioned in 1. 3. The decision to redirect the user comes quite far down in the upstream function. Before that happens a lot of stuff that may not be important since after the redirect response comes a new request anyway. Also, I suspect that this causes the caching problem because there is a request to the forge server and its error handling with some recursions happening before. I propose to move two of the redirects before "Preparing" 4. The recursion in the upstream function makes it difficult to understand what is actually happening. I added some more logging to have an easier time with that. 5. I changed the default behaviour to append a trailing slash to the path to true. In my tested scenarios it happened anyway. This way there is no recursion happening before the redirect. I am not developing in go frequently and rarely contribute to open source -> so feedback of all kind is appreciated closes #164 Reviewed-on: https://codeberg.org/Codeberg/pages-server/pulls/292 Reviewed-by: 6543 <6543@obermui.de> Reviewed-by: crapStone <codeberg@crapstone.dev> Co-authored-by: Hoernschen <julian.hoernschemeyer@mailbox.org> Co-committed-by: Hoernschen <julian.hoernschemeyer@mailbox.org>
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log.Trace().Msg("append trailing slash and redirect")
ctx.Redirect(ctx.Path()+"/", http.StatusTemporaryRedirect)
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return true
}
if strings.HasSuffix(ctx.Path(), "/index.html") && !o.ServeRaw {
FIX blank internal pages (#164) (#292) Hello 👋 since it affected my deployment of the pages server I started to look into the problem of the blank pages and think I found a solution for it: 1. There is no check if the file response is empty, neither in cache retrieval nor in writing of a cache. Also the provided method for checking for empty responses had a bug. 2. I identified the redirect response to be the issue here. There is a cache write with the full cache key (e. g. rawContent/user/repo|branch|route/index.html) happening in the handling of the redirect response. But the written body here is empty. In the triggered request from the redirect response the server then finds a cache item to the key and serves the empty body. A quick fix is the check for empty file responses mentioned in 1. 3. The decision to redirect the user comes quite far down in the upstream function. Before that happens a lot of stuff that may not be important since after the redirect response comes a new request anyway. Also, I suspect that this causes the caching problem because there is a request to the forge server and its error handling with some recursions happening before. I propose to move two of the redirects before "Preparing" 4. The recursion in the upstream function makes it difficult to understand what is actually happening. I added some more logging to have an easier time with that. 5. I changed the default behaviour to append a trailing slash to the path to true. In my tested scenarios it happened anyway. This way there is no recursion happening before the redirect. I am not developing in go frequently and rarely contribute to open source -> so feedback of all kind is appreciated closes #164 Reviewed-on: https://codeberg.org/Codeberg/pages-server/pulls/292 Reviewed-by: 6543 <6543@obermui.de> Reviewed-by: crapStone <codeberg@crapstone.dev> Co-authored-by: Hoernschen <julian.hoernschemeyer@mailbox.org> Co-committed-by: Hoernschen <julian.hoernschemeyer@mailbox.org>
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log.Trace().Msg("remove index.html from path and redirect")
ctx.Redirect(strings.TrimSuffix(ctx.Path(), "index.html"), http.StatusTemporaryRedirect)
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return true
}
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if o.redirectIfExists != "" {
ctx.Redirect(o.redirectIfExists, http.StatusTemporaryRedirect)
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return true
}
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// Set ETag & MIME
o.setHeader(ctx, header)
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log.Debug().Msg("Prepare response")
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ctx.RespWriter.WriteHeader(ctx.StatusCode)
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// Write the response body to the original request
if reader != nil {
_, err := io.Copy(ctx.RespWriter, reader)
if err != nil {
log.Error().Err(err).Msgf("Couldn't write body for %q", o.TargetPath)
html.ReturnErrorPage(ctx, "", http.StatusInternalServerError)
return true
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}
}
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log.Debug().Msg("Sending response")
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return true
}