[feature] More consistent API error handling (#637)

* update templates

* start reworking api error handling

* update template

* return AP status at web endpoint if negotiated

* start making api error handling much more consistent

* update account endpoints to new error handling

* use new api error handling in admin endpoints

* go fmt ./...

* use api error logic in app

* use generic error handling in auth

* don't export generic error handler

* don't defer clearing session

* user nicer error handling on oidc callback handler

* tidy up the sign in handler

* tidy up the token handler

* use nicer error handling in blocksget

* auth emojis endpoint

* fix up remaining api endpoints

* fix whoopsie during login flow

* regenerate swagger docs

* change http error logging to debug

11 files changed, 177 insertions, 215 deletions

diff --git a/internal/api/s2s/nodeinfo/nodeinfoget.go b/internal/api/s2s/nodeinfo/nodeinfoget.go
index 8b3b1cfba..8f111bd98 100644
--- a/internal/api/s2s/nodeinfo/nodeinfoget.go
+++ b/internal/api/s2s/nodeinfo/nodeinfoget.go
@@ -23,8 +23,8 @@ import (
 	"net/http"
 
 	"github.com/gin-gonic/gin"
-	"github.com/sirupsen/logrus"
 	"github.com/superseriousbusiness/gotosocial/internal/api"
+	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
 )
 
 // NodeInfoGETHandler swagger:operation GET /nodeinfo/2.0 nodeInfoGet
@@ -45,26 +45,21 @@ import (
 //     schema:
 //       "$ref": "#/definitions/nodeinfo"
 func (m *Module) NodeInfoGETHandler(c *gin.Context) {
-	l := logrus.WithFields(logrus.Fields{
-		"func":       "NodeInfoGETHandler",
-		"user-agent": c.Request.UserAgent(),
-	})
-
 	if _, err := api.NegotiateAccept(c, api.JSONAcceptHeaders...); err != nil {
-		c.JSON(http.StatusNotAcceptable, gin.H{"error": err.Error()})
+		api.ErrorHandler(c, gtserror.NewErrorNotAcceptable(err, err.Error()), m.processor.InstanceGet)
 		return
 	}
 
-	ni, err := m.processor.GetNodeInfo(c.Request.Context(), c.Request)
-	if err != nil {
-		l.Debugf("error with get node info request: %s", err)
-		c.JSON(err.Code(), err.Safe())
+	ni, errWithCode := m.processor.GetNodeInfo(c.Request.Context(), c.Request)
+	if errWithCode != nil {
+		api.ErrorHandler(c, errWithCode, m.processor.InstanceGet)
 		return
 	}
 
-	b, jsonErr := json.Marshal(ni)
-	if jsonErr != nil {
-		c.JSON(http.StatusInternalServerError, gin.H{"error": jsonErr.Error()})
+	b, err := json.Marshal(ni)
+	if err != nil {
+		api.ErrorHandler(c, gtserror.NewErrorInternalError(err), m.processor.InstanceGet)
+		return
 	}
 
 	c.Data(http.StatusOK, `application/json; profile="http://nodeinfo.diaspora.software/ns/schema/2.0#"`, b)
diff --git a/internal/api/s2s/nodeinfo/wellknownget.go b/internal/api/s2s/nodeinfo/wellknownget.go
index 6fa3c4623..27e18987f 100644
--- a/internal/api/s2s/nodeinfo/wellknownget.go
+++ b/internal/api/s2s/nodeinfo/wellknownget.go
@@ -22,8 +22,8 @@ import (
 	"net/http"
 
 	"github.com/gin-gonic/gin"
-	"github.com/sirupsen/logrus"
 	"github.com/superseriousbusiness/gotosocial/internal/api"
+	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
 )
 
 // NodeInfoWellKnownGETHandler swagger:operation GET /.well-known/nodeinfo nodeInfoWellKnownGet
@@ -45,19 +45,14 @@ import (
 //     schema:
 //       "$ref": "#/definitions/wellKnownResponse"
 func (m *Module) NodeInfoWellKnownGETHandler(c *gin.Context) {
-	l := logrus.WithFields(logrus.Fields{
-		"func": "NodeInfoWellKnownGETHandler",
-	})
-
 	if _, err := api.NegotiateAccept(c, api.JSONAcceptHeaders...); err != nil {
-		c.JSON(http.StatusNotAcceptable, gin.H{"error": err.Error()})
+		api.ErrorHandler(c, gtserror.NewErrorNotAcceptable(err, err.Error()), m.processor.InstanceGet)
 		return
 	}
 
-	niRel, err := m.processor.GetNodeInfoRel(c.Request.Context(), c.Request)
-	if err != nil {
-		l.Debugf("error with get node info rel request: %s", err)
-		c.JSON(err.Code(), err.Safe())
+	niRel, errWithCode := m.processor.GetNodeInfoRel(c.Request.Context(), c.Request)
+	if errWithCode != nil {
+		api.ErrorHandler(c, errWithCode, m.processor.InstanceGet)
 		return
 	}
 
diff --git a/internal/api/s2s/user/followers.go b/internal/api/s2s/user/followers.go
index ce5a03276..77c0e1307 100644
--- a/internal/api/s2s/user/followers.go
+++ b/internal/api/s2s/user/followers.go
@@ -20,48 +20,45 @@ package user
 
 import (
 	"encoding/json"
-	"fmt"
+	"errors"
 	"net/http"
+	"strings"
 
 	"github.com/gin-gonic/gin"
-	"github.com/sirupsen/logrus"
 	"github.com/superseriousbusiness/gotosocial/internal/api"
+	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
 )
 
 // FollowersGETHandler returns a collection of URIs for followers of the target user, formatted so that other AP servers can understand it.
 func (m *Module) FollowersGETHandler(c *gin.Context) {
-	l := logrus.WithFields(logrus.Fields{
-		"func": "FollowersGETHandler",
-		"url":  c.Request.RequestURI,
-	})
-
-	requestedUsername := c.Param(UsernameKey)
+	// usernames on our instance are always lowercase
+	requestedUsername := strings.ToLower(c.Param(UsernameKey))
 	if requestedUsername == "" {
-		c.JSON(http.StatusBadRequest, gin.H{"error": "no username specified in request"})
+		err := errors.New("no username specified in request")
+		api.ErrorHandler(c, gtserror.NewErrorBadRequest(err, err.Error()), m.processor.InstanceGet)
 		return
 	}
 
-	format, err := api.NegotiateAccept(c, api.ActivityPubAcceptHeaders...)
+	format, err := api.NegotiateAccept(c, api.HTMLOrActivityPubHeaders...)
 	if err != nil {
-		c.JSON(http.StatusNotAcceptable, gin.H{"error": err.Error()})
+		api.ErrorHandler(c, gtserror.NewErrorNotAcceptable(err, err.Error()), m.processor.InstanceGet)
 		return
 	}
-	l.Tracef("negotiated format: %s", format)
 
-	ctx := transferContext(c)
+	if format == string(api.TextHTML) {
+		// redirect to the user's profile
+		c.Redirect(http.StatusSeeOther, "/@"+requestedUsername)
+	}
 
-	followers, errWithCode := m.processor.GetFediFollowers(ctx, requestedUsername, c.Request.URL)
+	resp, errWithCode := m.processor.GetFediFollowers(transferContext(c), requestedUsername, c.Request.URL)
 	if errWithCode != nil {
-		l.Info(errWithCode.Error())
-		c.JSON(errWithCode.Code(), gin.H{"error": errWithCode.Safe()})
+		api.ErrorHandler(c, errWithCode, m.processor.InstanceGet)
 		return
 	}
 
-	b, mErr := json.Marshal(followers)
-	if mErr != nil {
-		err := fmt.Errorf("could not marshal json: %s", mErr)
-		l.Error(err)
-		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+	b, err := json.Marshal(resp)
+	if err != nil {
+		api.ErrorHandler(c, gtserror.NewErrorInternalError(err), m.processor.InstanceGet)
 		return
 	}
 
diff --git a/internal/api/s2s/user/following.go b/internal/api/s2s/user/following.go
index ca3d4bb4c..14dc9343f 100644
--- a/internal/api/s2s/user/following.go
+++ b/internal/api/s2s/user/following.go
@@ -20,48 +20,45 @@ package user
 
 import (
 	"encoding/json"
-	"fmt"
+	"errors"
 	"net/http"
+	"strings"
 
 	"github.com/gin-gonic/gin"
-	"github.com/sirupsen/logrus"
 	"github.com/superseriousbusiness/gotosocial/internal/api"
+	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
 )
 
 // FollowingGETHandler returns a collection of URIs for accounts that the target user follows, formatted so that other AP servers can understand it.
 func (m *Module) FollowingGETHandler(c *gin.Context) {
-	l := logrus.WithFields(logrus.Fields{
-		"func": "FollowingGETHandler",
-		"url":  c.Request.RequestURI,
-	})
-
-	requestedUsername := c.Param(UsernameKey)
+	// usernames on our instance are always lowercase
+	requestedUsername := strings.ToLower(c.Param(UsernameKey))
 	if requestedUsername == "" {
-		c.JSON(http.StatusBadRequest, gin.H{"error": "no username specified in request"})
+		err := errors.New("no username specified in request")
+		api.ErrorHandler(c, gtserror.NewErrorBadRequest(err, err.Error()), m.processor.InstanceGet)
 		return
 	}
 
-	format, err := api.NegotiateAccept(c, api.ActivityPubAcceptHeaders...)
+	format, err := api.NegotiateAccept(c, api.HTMLOrActivityPubHeaders...)
 	if err != nil {
-		c.JSON(http.StatusNotAcceptable, gin.H{"error": err.Error()})
+		api.ErrorHandler(c, gtserror.NewErrorNotAcceptable(err, err.Error()), m.processor.InstanceGet)
 		return
 	}
-	l.Tracef("negotiated format: %s", format)
 
-	ctx := transferContext(c)
+	if format == string(api.TextHTML) {
+		// redirect to the user's profile
+		c.Redirect(http.StatusSeeOther, "/@"+requestedUsername)
+	}
 
-	following, errWithCode := m.processor.GetFediFollowing(ctx, requestedUsername, c.Request.URL)
+	resp, errWithCode := m.processor.GetFediFollowing(transferContext(c), requestedUsername, c.Request.URL)
 	if errWithCode != nil {
-		l.Info(errWithCode.Error())
-		c.JSON(errWithCode.Code(), gin.H{"error": errWithCode.Safe()})
+		api.ErrorHandler(c, errWithCode, m.processor.InstanceGet)
 		return
 	}
 
-	b, mErr := json.Marshal(following)
-	if mErr != nil {
-		err := fmt.Errorf("could not marshal json: %s", mErr)
-		l.Error(err)
-		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+	b, err := json.Marshal(resp)
+	if err != nil {
+		api.ErrorHandler(c, gtserror.NewErrorInternalError(err), m.processor.InstanceGet)
 		return
 	}
 
diff --git a/internal/api/s2s/user/inboxpost.go b/internal/api/s2s/user/inboxpost.go
index 6e17850fd..fa6792cd2 100644
--- a/internal/api/s2s/user/inboxpost.go
+++ b/internal/api/s2s/user/inboxpost.go
@@ -19,43 +19,33 @@
 package user
 
 import (
-	"net/http"
+	"errors"
+	"strings"
 
 	"github.com/gin-gonic/gin"
-	"github.com/sirupsen/logrus"
+	"github.com/superseriousbusiness/gotosocial/internal/api"
 	"github.com/superseriousbusiness/gotosocial/internal/gtserror" //nolint:typecheck
 )
 
 // InboxPOSTHandler deals with incoming POST requests to an actor's inbox.
 // Eg., POST to https://example.org/users/whatever/inbox.
 func (m *Module) InboxPOSTHandler(c *gin.Context) {
-	l := logrus.WithFields(logrus.Fields{
-		"func": "InboxPOSTHandler",
-		"url":  c.Request.RequestURI,
-	})
-
-	requestedUsername := c.Param(UsernameKey)
+	// usernames on our instance are always lowercase
+	requestedUsername := strings.ToLower(c.Param(UsernameKey))
 	if requestedUsername == "" {
-		c.JSON(http.StatusBadRequest, gin.H{"error": "no username specified in request"})
+		err := errors.New("no username specified in request")
+		api.ErrorHandler(c, gtserror.NewErrorBadRequest(err, err.Error()), m.processor.InstanceGet)
 		return
 	}
 
-	ctx := transferContext(c)
-
-	posted, err := m.processor.InboxPost(ctx, c.Writer, c.Request)
-	if err != nil {
+	if posted, err := m.processor.InboxPost(transferContext(c), c.Writer, c.Request); err != nil {
 		if withCode, ok := err.(gtserror.WithCode); ok {
-			l.Debugf("InboxPOSTHandler: %s", withCode.Error())
-			c.JSON(withCode.Code(), withCode.Safe())
-			return
+			api.ErrorHandler(c, withCode, m.processor.InstanceGet)
+		} else {
+			api.ErrorHandler(c, gtserror.NewErrorBadRequest(err, err.Error()), m.processor.InstanceGet)
 		}
-		l.Debugf("InboxPOSTHandler: error processing request: %s", err)
-		c.JSON(http.StatusBadRequest, gin.H{"error": "unable to process request"})
-		return
-	}
-
-	if !posted {
-		l.Debugf("InboxPOSTHandler: request could not be handled as an AP request; headers were: %+v", c.Request.Header)
-		c.JSON(http.StatusBadRequest, gin.H{"error": "unable to process request"})
+	} else if !posted {
+		err := errors.New("unable to process request")
+		api.ErrorHandler(c, gtserror.NewErrorBadRequest(err, err.Error()), m.processor.InstanceGet)
 	}
 }
diff --git a/internal/api/s2s/user/outboxget.go b/internal/api/s2s/user/outboxget.go
index b8e6126df..568e48017 100644
--- a/internal/api/s2s/user/outboxget.go
+++ b/internal/api/s2s/user/outboxget.go
@@ -20,13 +20,15 @@ package user
 
 import (
 	"encoding/json"
+	"errors"
 	"fmt"
 	"net/http"
 	"strconv"
+	"strings"
 
 	"github.com/gin-gonic/gin"
-	"github.com/sirupsen/logrus"
 	"github.com/superseriousbusiness/gotosocial/internal/api"
+	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
 )
 
 // OutboxGETHandler swagger:operation GET /users/{username}/outbox s2sOutboxGet
@@ -80,23 +82,31 @@ import (
 //   '404':
 //      description: not found
 func (m *Module) OutboxGETHandler(c *gin.Context) {
-	l := logrus.WithFields(logrus.Fields{
-		"func": "OutboxGETHandler",
-		"url":  c.Request.RequestURI,
-	})
-
-	requestedUsername := c.Param(UsernameKey)
+	// usernames on our instance are always lowercase
+	requestedUsername := strings.ToLower(c.Param(UsernameKey))
 	if requestedUsername == "" {
-		c.JSON(http.StatusBadRequest, gin.H{"error": "no username specified in request"})
+		err := errors.New("no username specified in request")
+		api.ErrorHandler(c, gtserror.NewErrorBadRequest(err, err.Error()), m.processor.InstanceGet)
 		return
 	}
 
+	format, err := api.NegotiateAccept(c, api.HTMLOrActivityPubHeaders...)
+	if err != nil {
+		api.ErrorHandler(c, gtserror.NewErrorNotAcceptable(err, err.Error()), m.processor.InstanceGet)
+		return
+	}
+
+	if format == string(api.TextHTML) {
+		// redirect to the user's profile
+		c.Redirect(http.StatusSeeOther, "/@"+requestedUsername)
+	}
+
 	var page bool
 	if pageString := c.Query(PageKey); pageString != "" {
 		i, err := strconv.ParseBool(pageString)
 		if err != nil {
-			l.Debugf("error parsing page string: %s", err)
-			c.JSON(http.StatusBadRequest, gin.H{"error": "couldn't parse page query param"})
+			err := fmt.Errorf("error parsing %s: %s", PageKey, err)
+			api.ErrorHandler(c, gtserror.NewErrorBadRequest(err, err.Error()), m.processor.InstanceGet)
 			return
 		}
 		page = i
@@ -114,27 +124,15 @@ func (m *Module) OutboxGETHandler(c *gin.Context) {
 		maxID = maxIDString
 	}
 
-	format, err := api.NegotiateAccept(c, api.ActivityPubAcceptHeaders...)
-	if err != nil {
-		c.JSON(http.StatusNotAcceptable, gin.H{"error": err.Error()})
-		return
-	}
-	l.Tracef("negotiated format: %s", format)
-
-	ctx := transferContext(c)
-
-	outbox, errWithCode := m.processor.GetFediOutbox(ctx, requestedUsername, page, maxID, minID, c.Request.URL)
+	resp, errWithCode := m.processor.GetFediOutbox(transferContext(c), requestedUsername, page, maxID, minID, c.Request.URL)
 	if errWithCode != nil {
-		l.Info(errWithCode.Error())
-		c.JSON(errWithCode.Code(), gin.H{"error": errWithCode.Safe()})
+		api.ErrorHandler(c, errWithCode, m.processor.InstanceGet)
 		return
 	}
 
-	b, mErr := json.Marshal(outbox)
-	if mErr != nil {
-		err := fmt.Errorf("could not marshal json: %s", mErr)
-		l.Error(err)
-		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+	b, err := json.Marshal(resp)
+	if err != nil {
+		api.ErrorHandler(c, gtserror.NewErrorInternalError(err), m.processor.InstanceGet)
 		return
 	}
 
diff --git a/internal/api/s2s/user/publickeyget.go b/internal/api/s2s/user/publickeyget.go
index 6e963e191..e929c461d 100644
--- a/internal/api/s2s/user/publickeyget.go
+++ b/internal/api/s2s/user/publickeyget.go
@@ -20,12 +20,13 @@ package user
 
 import (
 	"encoding/json"
-	"fmt"
+	"errors"
 	"net/http"
+	"strings"
 
 	"github.com/gin-gonic/gin"
-	"github.com/sirupsen/logrus"
 	"github.com/superseriousbusiness/gotosocial/internal/api"
+	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
 )
 
 // PublicKeyGETHandler should be served at eg https://example.org/users/:username/main-key.
@@ -34,38 +35,34 @@ import (
 // in the form of a vocab.ActivityStreamsPerson. The account will only contain the id,
 // public key, username, and type of the account.
 func (m *Module) PublicKeyGETHandler(c *gin.Context) {
-	l := logrus.WithFields(logrus.Fields{
-		"func": "PublicKeyGETHandler",
-		"url":  c.Request.RequestURI,
-	})
-
-	requestedUsername := c.Param(UsernameKey)
+	// usernames on our instance are always lowercase
+	requestedUsername := strings.ToLower(c.Param(UsernameKey))
 	if requestedUsername == "" {
-		c.JSON(http.StatusBadRequest, gin.H{"error": "no username specified in request"})
+		err := errors.New("no username specified in request")
+		api.ErrorHandler(c, gtserror.NewErrorBadRequest(err, err.Error()), m.processor.InstanceGet)
 		return
 	}
 
-	format, err := api.NegotiateAccept(c, api.ActivityPubAcceptHeaders...)
+	format, err := api.NegotiateAccept(c, api.HTMLOrActivityPubHeaders...)
 	if err != nil {
-		c.JSON(http.StatusNotAcceptable, gin.H{"error": err.Error()})
+		api.ErrorHandler(c, gtserror.NewErrorNotAcceptable(err, err.Error()), m.processor.InstanceGet)
 		return
 	}
-	l.Tracef("negotiated format: %s", format)
 
-	ctx := transferContext(c)
+	if format == string(api.TextHTML) {
+		// redirect to the user's profile
+		c.Redirect(http.StatusSeeOther, "/@"+requestedUsername)
+	}
 
-	user, errWithCode := m.processor.GetFediUser(ctx, requestedUsername, c.Request.URL)
+	resp, errWithCode := m.processor.GetFediUser(transferContext(c), requestedUsername, c.Request.URL)
 	if errWithCode != nil {
-		l.Info(errWithCode.Error())
-		c.JSON(errWithCode.Code(), gin.H{"error": errWithCode.Safe()})
+		api.ErrorHandler(c, errWithCode, m.processor.InstanceGet)
 		return
 	}
 
-	b, mErr := json.Marshal(user)
-	if mErr != nil {
-		err := fmt.Errorf("could not marshal json: %s", mErr)
-		l.Error(err)
-		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+	b, err := json.Marshal(resp)
+	if err != nil {
+		api.ErrorHandler(c, gtserror.NewErrorInternalError(err), m.processor.InstanceGet)
 		return
 	}
 
diff --git a/internal/api/s2s/user/repliesget.go b/internal/api/s2s/user/repliesget.go
index 388f69885..6ef5a5f43 100644
--- a/internal/api/s2s/user/repliesget.go
+++ b/internal/api/s2s/user/repliesget.go
@@ -20,13 +20,15 @@ package user
 
 import (
 	"encoding/json"
+	"errors"
 	"fmt"
 	"net/http"
 	"strconv"
+	"strings"
 
 	"github.com/gin-gonic/gin"
-	"github.com/sirupsen/logrus"
 	"github.com/superseriousbusiness/gotosocial/internal/api"
+	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
 )
 
 // StatusRepliesGETHandler swagger:operation GET /users/{username}/statuses/{status}/replies s2sRepliesGet
@@ -86,29 +88,39 @@ import (
 //   '404':
 //      description: not found
 func (m *Module) StatusRepliesGETHandler(c *gin.Context) {
-	l := logrus.WithFields(logrus.Fields{
-		"func": "StatusRepliesGETHandler",
-		"url":  c.Request.RequestURI,
-	})
-
-	requestedUsername := c.Param(UsernameKey)
+	// usernames on our instance are always lowercase
+	requestedUsername := strings.ToLower(c.Param(UsernameKey))
 	if requestedUsername == "" {
-		c.JSON(http.StatusBadRequest, gin.H{"error": "no username specified in request"})
+		err := errors.New("no username specified in request")
+		api.ErrorHandler(c, gtserror.NewErrorBadRequest(err, err.Error()), m.processor.InstanceGet)
 		return
 	}
 
-	requestedStatusID := c.Param(StatusIDKey)
+	// status IDs on our instance are always uppercase
+	requestedStatusID := strings.ToUpper(c.Param(StatusIDKey))
 	if requestedStatusID == "" {
-		c.JSON(http.StatusBadRequest, gin.H{"error": "no status id specified in request"})
+		err := errors.New("no status id specified in request")
+		api.ErrorHandler(c, gtserror.NewErrorBadRequest(err, err.Error()), m.processor.InstanceGet)
 		return
 	}
 
+	format, err := api.NegotiateAccept(c, api.HTMLOrActivityPubHeaders...)
+	if err != nil {
+		api.ErrorHandler(c, gtserror.NewErrorNotAcceptable(err, err.Error()), m.processor.InstanceGet)
+		return
+	}
+
+	if format == string(api.TextHTML) {
+		// redirect to the status
+		c.Redirect(http.StatusSeeOther, "/@"+requestedUsername+"/statuses/"+requestedStatusID)
+	}
+
 	var page bool
 	if pageString := c.Query(PageKey); pageString != "" {
 		i, err := strconv.ParseBool(pageString)
 		if err != nil {
-			l.Debugf("error parsing page string: %s", err)
-			c.JSON(http.StatusBadRequest, gin.H{"error": "couldn't parse page query param"})
+			err := fmt.Errorf("error parsing %s: %s", PageKey, err)
+			api.ErrorHandler(c, gtserror.NewErrorBadRequest(err, err.Error()), m.processor.InstanceGet)
 			return
 		}
 		page = i
@@ -119,8 +131,8 @@ func (m *Module) StatusRepliesGETHandler(c *gin.Context) {
 	if onlyOtherAccountsString != "" {
 		i, err := strconv.ParseBool(onlyOtherAccountsString)
 		if err != nil {
-			l.Debugf("error parsing only_other_accounts string: %s", err)
-			c.JSON(http.StatusBadRequest, gin.H{"error": "couldn't parse only_other_accounts query param"})
+			err := fmt.Errorf("error parsing %s: %s", OnlyOtherAccountsKey, err)
+			api.ErrorHandler(c, gtserror.NewErrorBadRequest(err, err.Error()), m.processor.InstanceGet)
 			return
 		}
 		onlyOtherAccounts = i
@@ -132,27 +144,15 @@ func (m *Module) StatusRepliesGETHandler(c *gin.Context) {
 		minID = minIDString
 	}
 
-	format, err := api.NegotiateAccept(c, api.ActivityPubAcceptHeaders...)
-	if err != nil {
-		c.JSON(http.StatusNotAcceptable, gin.H{"error": err.Error()})
-		return
-	}
-	l.Tracef("negotiated format: %s", format)
-
-	ctx := transferContext(c)
-
-	replies, errWithCode := m.processor.GetFediStatusReplies(ctx, requestedUsername, requestedStatusID, page, onlyOtherAccounts, minID, c.Request.URL)
+	resp, errWithCode := m.processor.GetFediStatusReplies(transferContext(c), requestedUsername, requestedStatusID, page, onlyOtherAccounts, minID, c.Request.URL)
 	if errWithCode != nil {
-		l.Info(errWithCode.Error())
-		c.JSON(errWithCode.Code(), gin.H{"error": errWithCode.Safe()})
+		api.ErrorHandler(c, errWithCode, m.processor.InstanceGet)
 		return
 	}
 
-	b, mErr := json.Marshal(replies)
-	if mErr != nil {
-		err := fmt.Errorf("could not marshal json: %s", mErr)
-		l.Error(err)
-		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+	b, err := json.Marshal(resp)
+	if err != nil {
+		api.ErrorHandler(c, gtserror.NewErrorInternalError(err), m.processor.InstanceGet)
 		return
 	}
 
diff --git a/internal/api/s2s/user/statusget.go b/internal/api/s2s/user/statusget.go
index 3dee0c88a..b6690c4de 100644
--- a/internal/api/s2s/user/statusget.go
+++ b/internal/api/s2s/user/statusget.go
@@ -20,57 +20,53 @@ package user
 
 import (
 	"encoding/json"
-	"fmt"
+	"errors"
 	"net/http"
 	"strings"
 
 	"github.com/gin-gonic/gin"
-	"github.com/sirupsen/logrus"
 	"github.com/superseriousbusiness/gotosocial/internal/api"
+	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
 )
 
 // StatusGETHandler serves the target status as an activitystreams NOTE so that other AP servers can parse it.
 func (m *Module) StatusGETHandler(c *gin.Context) {
-	l := logrus.WithFields(logrus.Fields{
-		"func": "StatusGETHandler",
-		"url":  c.Request.RequestURI,
-	})
-
 	// usernames on our instance are always lowercase
 	requestedUsername := strings.ToLower(c.Param(UsernameKey))
 	if requestedUsername == "" {
-		c.JSON(http.StatusBadRequest, gin.H{"error": "no username specified in request"})
+		err := errors.New("no username specified in request")
+		api.ErrorHandler(c, gtserror.NewErrorBadRequest(err, err.Error()), m.processor.InstanceGet)
 		return
 	}
 
 	// status IDs on our instance are always uppercase
 	requestedStatusID := strings.ToUpper(c.Param(StatusIDKey))
 	if requestedStatusID == "" {
-		c.JSON(http.StatusBadRequest, gin.H{"error": "no status id specified in request"})
+		err := errors.New("no status id specified in request")
+		api.ErrorHandler(c, gtserror.NewErrorBadRequest(err, err.Error()), m.processor.InstanceGet)
 		return
 	}
 
-	format, err := api.NegotiateAccept(c, api.ActivityPubAcceptHeaders...)
+	format, err := api.NegotiateAccept(c, api.HTMLOrActivityPubHeaders...)
 	if err != nil {
-		c.JSON(http.StatusNotAcceptable, gin.H{"error": err.Error()})
+		api.ErrorHandler(c, gtserror.NewErrorNotAcceptable(err, err.Error()), m.processor.InstanceGet)
 		return
 	}
-	l.Tracef("negotiated format: %s", format)
 
-	ctx := transferContext(c)
+	if format == string(api.TextHTML) {
+		// redirect to the status
+		c.Redirect(http.StatusSeeOther, "/@"+requestedUsername+"/statuses/"+requestedStatusID)
+	}
 
-	status, errWithCode := m.processor.GetFediStatus(ctx, requestedUsername, requestedStatusID, c.Request.URL)
+	resp, errWithCode := m.processor.GetFediStatus(transferContext(c), requestedUsername, requestedStatusID, c.Request.URL)
 	if errWithCode != nil {
-		l.Info(errWithCode.Error())
-		c.JSON(errWithCode.Code(), gin.H{"error": errWithCode.Safe()})
+		api.ErrorHandler(c, errWithCode, m.processor.InstanceGet)
 		return
 	}
 
-	b, mErr := json.Marshal(status)
-	if mErr != nil {
-		err := fmt.Errorf("could not marshal json: %s", mErr)
-		l.Error(err)
-		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+	b, err := json.Marshal(resp)
+	if err != nil {
+		api.ErrorHandler(c, gtserror.NewErrorInternalError(err), m.processor.InstanceGet)
 		return
 	}
 
diff --git a/internal/api/s2s/user/userget.go b/internal/api/s2s/user/userget.go
index c034e6bfc..b5e8a84c9 100644
--- a/internal/api/s2s/user/userget.go
+++ b/internal/api/s2s/user/userget.go
@@ -20,12 +20,13 @@ package user
 
 import (
 	"encoding/json"
-	"fmt"
+	"errors"
 	"net/http"
+	"strings"
 
 	"github.com/gin-gonic/gin"
-	"github.com/sirupsen/logrus"
 	"github.com/superseriousbusiness/gotosocial/internal/api"
+	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
 )
 
 // UsersGETHandler should be served at https://example.org/users/:username.
@@ -38,38 +39,34 @@ import (
 // And of course, the request should be refused if the account or server making the
 // request is blocked.
 func (m *Module) UsersGETHandler(c *gin.Context) {
-	l := logrus.WithFields(logrus.Fields{
-		"func": "UsersGETHandler",
-		"url":  c.Request.RequestURI,
-	})
-
-	requestedUsername := c.Param(UsernameKey)
+	// usernames on our instance are always lowercase
+	requestedUsername := strings.ToLower(c.Param(UsernameKey))
 	if requestedUsername == "" {
-		c.JSON(http.StatusBadRequest, gin.H{"error": "no username specified in request"})
+		err := errors.New("no username specified in request")
+		api.ErrorHandler(c, gtserror.NewErrorBadRequest(err, err.Error()), m.processor.InstanceGet)
 		return
 	}
 
-	format, err := api.NegotiateAccept(c, api.ActivityPubAcceptHeaders...)
+	format, err := api.NegotiateAccept(c, api.HTMLOrActivityPubHeaders...)
 	if err != nil {
-		c.JSON(http.StatusNotAcceptable, gin.H{"error": err.Error()})
+		api.ErrorHandler(c, gtserror.NewErrorNotAcceptable(err, err.Error()), m.processor.InstanceGet)
 		return
 	}
-	l.Tracef("negotiated format: %s", format)
 
-	ctx := transferContext(c)
+	if format == string(api.TextHTML) {
+		// redirect to the user's profile
+		c.Redirect(http.StatusSeeOther, "/@"+requestedUsername)
+	}
 
-	user, errWithCode := m.processor.GetFediUser(ctx, requestedUsername, c.Request.URL) // GetFediUser handles auth as well
+	resp, errWithCode := m.processor.GetFediUser(transferContext(c), requestedUsername, c.Request.URL)
 	if errWithCode != nil {
-		l.Info(errWithCode.Error())
-		c.JSON(errWithCode.Code(), gin.H{"error": errWithCode.Safe()})
+		api.ErrorHandler(c, errWithCode, m.processor.InstanceGet)
 		return
 	}
 
-	b, mErr := json.Marshal(user)
-	if mErr != nil {
-		err := fmt.Errorf("could not marshal json: %s", mErr)
-		l.Error(err)
-		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+	b, err := json.Marshal(resp)
+	if err != nil {
+		api.ErrorHandler(c, gtserror.NewErrorInternalError(err), m.processor.InstanceGet)
 		return
 	}
 
diff --git a/internal/api/s2s/webfinger/webfingerget.go b/internal/api/s2s/webfinger/webfingerget.go
index a271c031b..7e7ca006b 100644
--- a/internal/api/s2s/webfinger/webfingerget.go
+++ b/internal/api/s2s/webfinger/webfingerget.go
@@ -27,6 +27,7 @@ import (
 	"github.com/gin-gonic/gin"
 	"github.com/sirupsen/logrus"
 	"github.com/superseriousbusiness/gotosocial/internal/ap"
+	"github.com/superseriousbusiness/gotosocial/internal/api"
 	"github.com/superseriousbusiness/gotosocial/internal/config"
 )
 
@@ -105,10 +106,9 @@ func (m *Module) WebfingerGETRequest(c *gin.Context) {
 		ctx = context.WithValue(ctx, ap.ContextRequestingPublicKeyVerifier, verifier)
 	}
 
-	resp, err := m.processor.GetWebfingerAccount(ctx, username)
-	if err != nil {
-		l.Debugf("aborting request with an error: %s", err.Error())
-		c.JSON(err.Code(), gin.H{"error": err.Safe()})
+	resp, errWithCode := m.processor.GetWebfingerAccount(ctx, username)
+	if errWithCode != nil {
+		api.ErrorHandler(c, errWithCode, m.processor.InstanceGet)
 		return
 	}